J/A+A/706/A41ivo://CDS.VizieR/J/A+A/706/A41CDSSchwope A.D.Marsh T.R.Parsons S.G.Vogel J.Dhillon V.S.2026-01-28T08:09:48Z2026-01-28T09:08:24ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.freclipsing-binary-starscataclysmic-variable-starsvisible-astronomyultraviolet-astronomyphotometryWe present an analysis of high-speed u- and r-band photometry of the eclipsing polar HU Aqr that was obtained with ULTRACAM mounted on the VLT. The observations were performed during a low state, permitting us for the first time to determine the contact points of the white dwarf. Using LCURVE we could determine its size, and hence mass, with a direct method and with unprecedented accuracy. We determined the mass of the white dwarf as 0.78+/-0.02M_{sun}_, the mass ratio Q=M_WD_/Msec=4.59, and the orbital inclination i=87.4+/-0.9{deg}. An extended warm region with a central temperature of ~33000K was observed in the u-band at the location of the previous high-state accretion spot. Weak accretion was ongoing in the low state that led to cyclotron emission that could best be studied with the r-band data. It has a diameter of only 3{deg} to 4{deg} and is located much closer to the binary meridian than the accretion-heated region studied in the u-band. The longitudinal shift of the two accretion regions is of order 30{deg}, due to early and late coupling of accreted matter onto the magnetic field lines in low and high accretion states, respectively. The low-state cyclotron-emitting region has a vertical extent of 0.005-0.016 RWD, a value that seems to be correlated to the instantaneous accretion rate.2026A&A...706A..41Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/706/A41CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/448/1118 : HU Aqr planetary system mid-egress momentshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/706/A41https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/706/A41http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/706/A41https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/706/A41https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/706/A41http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/706/A41GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticaldefaultJ/A+A/706/A41/run013Reduced data 14/05/2005, 08:32:34.00, ULTRACAM/VLTrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberFrame numbermeta.idintMJDModified Julian Date (UTC) centre of exposuredtime.epochdoubleindexedFlag[0/1] Time flag (1=OK,0=Not OK)meta.code.errorintNsatNumber satellitesmeta.numberintExpTimeExposure timestime.duration;obs.exposuredoubleCCD[1/3] CCD number (1=red,2=green,3=uv).meta.codeintFWHMFitted FWHM, =0 if no fit made.phys.angSize;meta.modelledfloatbeta? Fitted Moffat exponentarith.factor;meta.modelledfloatnullableNaper1Aperture numbermeta.codeintX1X-position of aperture 1pixpos.cartesian.x;instr.detfloatY1Y-position of aperture 1pixpos.cartesian.y;instr.detfloatXm1Measured aperture position (0,0) for aperture 1pixpos.cartesian.x;instr.detfloatYm1Invalid and/or linked apertures for aperture 1pixpos.cartesian.y;instr.detfloate_Xm1? 1-sigma uncertainty in measured aperture position for aperture 1pixstat.errorfloatnullablee_Ym1? (-1,-1) for invalid and/or linked apertures for aperture 1pixstat.errorfloatnullableCounts1Estimated target counts for aperture 1ctphot.countfloate_Counts1? 1-sigma uncertainty for aperture 1ctstat.errorfloatnullableSky1Sky background in counts for aperture 1ctphot.countfloatNSky1Number of sky pixels available for aperture 1meta.codeintNRej1Number of sky pixels rejected for aperture 1meta.codeintWorst1Value of worst bad pixel in aperture (0 OK) for aperture 1stat.fit.paraminterrorfl1Code for aperture 1 (1)meta.codeintNaper2Aperture numbermeta.codeintX2X-position of aperture 2pixpos.cartesian.x;instr.detfloatY2Y-position of aperture 2pixpos.cartesian.y;instr.detfloatXm2Measured aperture position (0,0) for aperture 2pixpos.cartesian.x;instr.detfloatYm2Invalid and/or linked apertures for aperture 2pixpos.cartesian.y;instr.detfloate_Xm2? 1-sigma uncertainty in measured aperture position for aperture 2pixstat.errorfloatnullablee_Ym2? (-1,-1) for invalid and/or linked apertures for aperture 2pixstat.errorfloatnullableCounts2Estimated target counts for aperture 2ctphot.countfloate_Counts2? 1-sigma uncertainty for aperture 2ctstat.errorfloatnullableSky2Sky background in counts for aperture 2ctphot.countfloatNSky2Number of sky pixels available for aperture 2meta.codeintNRej2? Number of sky pixels rejected for aperture 2meta.codeintnullableWorst2Value of worst bad pixel in aperture (0 OK) for aperture 2stat.fit.paraminterrorfl2Code for aperture 2 (1)meta.codeintJ/A+A/706/A41/run014Reduced data 14/05/2005, 09:59:02.00, ULTRACAM/VLTX1X-position of aperture 1pixpos.cartesian.x;instr.detfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberFrame numbermeta.idintMJDModified Julian Date (UTC) centre of exposuredtime.epochdoubleindexedFlag[0/1] Time flag (1=OK,0=Not OK)meta.code.errorintNsatNumber satellitesmeta.numberintExpTimeExposure timestime.duration;obs.exposuredoubleCCD[1/3] CCD number (1=red,2=green,3=uv).meta.codeintFWHMFitted FWHM, =0 if no fit made.phys.angSize;meta.modelledfloatbeta? Fitted Moffat exponentarith.factor;meta.modelledfloatnullableNaper1Aperture numbermeta.codeintY1Y-position of aperture 1pixpos.cartesian.y;instr.detfloatXm1Measured aperture position (0,0) for aperture 1pixpos.cartesian.x;instr.detfloatYm1Invalid and/or linked apertures for aperture 1pixpos.cartesian.y;instr.detfloate_Xm1? 1-sigma uncertainty in measured aperture position for aperture 1pixstat.errorfloatnullablee_Ym1? (-1,-1) for invalid and/or linked apertures for aperture 1pixstat.errorfloatnullableCounts1Estimated target counts for aperture 1ctphot.countfloate_Counts1? 1-sigma uncertainty for aperture 1ctstat.errorfloatnullableSky1Sky background in counts for aperture 1ctphot.countfloatNSky1Number of sky pixels available for aperture 1meta.codeintNRej1Number of sky pixels rejected for aperture 1meta.codeintWorst1Value of worst bad pixel in aperture (0 OK) for aperture 1stat.fit.paraminterrorfl1Code for aperture 1 (1)meta.codeintNaper2Aperture numbermeta.codeintX2X-position of aperture 2pixpos.cartesian.x;instr.detfloatY2Y-position of aperture 2pixpos.cartesian.y;instr.detfloatXm2Measured aperture position (0,0) for aperture 2pixpos.cartesian.x;instr.detfloatYm2Invalid and/or linked apertures for aperture 2pixpos.cartesian.y;instr.detfloate_Xm2? 1-sigma uncertainty in measured aperture position for aperture 2pixstat.errorfloatnullablee_Ym2? (-1,-1) for invalid and/or linked apertures for aperture 2pixstat.errorfloatnullableCounts2Estimated target counts for aperture 2ctphot.countfloate_Counts2? 1-sigma uncertainty for aperture 2ctstat.errorfloatnullableSky2Sky background in counts for aperture 2ctphot.countfloatNSky2Number of sky pixels available for aperture 2meta.codeintNRej2? Number of sky pixels rejected for aperture 2meta.codeintnullableWorst2Value of worst bad pixel in aperture (0 OK) for aperture 2stat.fit.paraminterrorfl2Code for aperture 2 (1)meta.codeintJ/A+A/706/A41/run020Reduced data 16/05/2005, 06:33:09.00, ULTRACAM/VLTNSky1Number of sky pixels available for aperture 1meta.codeintNRej1Number of sky pixels rejected for aperture 1meta.codeintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberFrame numbermeta.idintFlag[0/1] Time flag (1=OK,0=Not OK)meta.code.errorintNsatNumber satellitesmeta.numberintExpTimeExposure timestime.duration;obs.exposuredoubleCCD[1/3] CCD number (1=red,2=green,3=uv).meta.codeintFWHMFitted FWHM, =0 if no fit made.phys.angSize;meta.modelledfloatbeta? Fitted Moffat exponentarith.factor;meta.modelledfloatnullableNaper1Aperture numbermeta.codeintX1X-position of aperture 1pixpos.cartesian.x;instr.detfloatY1Y-position of aperture 1pixpos.cartesian.y;instr.detfloatXm1Measured aperture position (0,0) for aperture 1pixpos.cartesian.x;instr.detfloatYm1Invalid and/or linked apertures for aperture 1pixpos.cartesian.y;instr.detfloate_Xm1? 1-sigma uncertainty in measured aperture position for aperture 1pixstat.errorfloatnullablee_Ym1? (-1,-1) for invalid and/or linked apertures for aperture 1pixstat.errorfloatnullableCounts1Estimated target counts for aperture 1ctphot.countfloate_Counts1? 1-sigma uncertainty for aperture 1ctstat.errorfloatnullableSky1Sky background in counts for aperture 1ctphot.countfloatWorst1Value of worst bad pixel in aperture (0 OK) for aperture 1stat.fit.paraminterrorfl1Code for aperture 1 (1)meta.codeintNaper2Aperture numbermeta.codeintX2X-position of aperture 2pixpos.cartesian.x;instr.detfloatY2Y-position of aperture 2pixpos.cartesian.y;instr.detfloatXm2Measured aperture position (0,0) for aperture 2pixpos.cartesian.x;instr.detfloatYm2Invalid and/or linked apertures for aperture 2pixpos.cartesian.y;instr.detfloate_Xm2? 1-sigma uncertainty in measured aperture position for aperture 2pixstat.errorfloatnullablee_Ym2? (-1,-1) for invalid and/or linked apertures for aperture 2pixstat.errorfloatnullableCounts2Estimated target counts for aperture 2ctphot.countfloate_Counts2? 1-sigma uncertainty for aperture 2ctstat.errorfloatnullableSky2Sky background in counts for aperture 2ctphot.countfloatNSky2Number of sky pixels available for aperture 2meta.codeintNRej2? Number of sky pixels rejected for aperture 2meta.codeintnullableWorst2Value of worst bad pixel in aperture (0 OK) for aperture 2stat.fit.paraminterrorfl2Code for aperture 2 (1)meta.codeintMJDModified Julian Date (UTC) centre of exposuredtime.epochdoubleindexedJ/A+A/706/A41/run021Reduced data 16/05/2005, 07:49:14.00, ULTRACAM/VLTrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberFrame numbermeta.idintFlag[0/1] Time flag (1=OK,0=Not OK)meta.code.errorintNsatNumber satellitesmeta.numberintExpTimeExposure timestime.duration;obs.exposuredoubleCCD[1/3] CCD number (1=red,2=green,3=uv).meta.codeintFWHMFitted FWHM, =0 if no fit made.phys.angSize;meta.modelledfloatbeta? Fitted Moffat exponentarith.factor;meta.modelledfloatnullableNaper1Aperture numbermeta.codeintX1X-position of aperture 1pixpos.cartesian.x;instr.detfloatY1Y-position of aperture 1pixpos.cartesian.y;instr.detfloatXm1Measured aperture position (0,0) for aperture 1pixpos.cartesian.x;instr.detfloatYm1Invalid and/or linked apertures for aperture 1pixpos.cartesian.y;instr.detfloate_Xm1? 1-sigma uncertainty in measured aperture position for aperture 1pixstat.errorfloatnullablee_Ym1? (-1,-1) for invalid and/or linked apertures for aperture 1pixstat.errorfloatnullableCounts1Estimated target counts for aperture 1ctphot.countfloate_Counts1? 1-sigma uncertainty for aperture 1ctstat.errorfloatnullableSky1Sky background in counts for aperture 1ctphot.countfloatNSky1Number of sky pixels available for aperture 1meta.codeintNRej1Number of sky pixels rejected for aperture 1meta.codeintWorst1Value of worst bad pixel in aperture (0 OK) for aperture 1stat.fit.paraminterrorfl1Code for aperture 1 (1)meta.codeintNaper2Aperture numbermeta.codeintX2X-position of aperture 2pixpos.cartesian.x;instr.detfloatY2Y-position of aperture 2pixpos.cartesian.y;instr.detfloatXm2Measured aperture position (0,0) for aperture 2pixpos.cartesian.x;instr.detfloatYm2Invalid and/or linked apertures for aperture 2pixpos.cartesian.y;instr.detfloate_Xm2? 1-sigma uncertainty in measured aperture position for aperture 2pixstat.errorfloatnullablee_Ym2? (-1,-1) for invalid and/or linked apertures for aperture 2pixstat.errorfloatnullableCounts2Estimated target counts for aperture 2ctphot.countfloate_Counts2? 1-sigma uncertainty for aperture 2ctstat.errorfloatnullableSky2Sky background in counts for aperture 2ctphot.countfloatNSky2Number of sky pixels available for aperture 2meta.codeintNRej2? Number of sky pixels rejected for aperture 2meta.codeintnullableWorst2Value of worst bad pixel in aperture (0 OK) for aperture 2stat.fit.paraminterrorfl2Code for aperture 2 (1)meta.codeintMJDModified Julian Date (UTC) centre of exposuredtime.epochdoubleindexedJ/A+A/706/A41/run022Reduced data 16/05/2005, 09:28:42.00, ULTRACAM/VLTNsatNumber satellitesmeta.numberinte_Counts2? 1-sigma uncertainty for aperture 2ctstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberFrame numbermeta.idintMJDModified Julian Date (UTC) centre of exposuredtime.epochdoubleFlag[0/1] Time flag (1=OK,0=Not OK)meta.code.errorintExpTimeExposure timestime.duration;obs.exposuredoubleCCD[1/3] CCD number (1=red,2=green,3=uv).meta.codeintFWHMFitted FWHM, =0 if no fit made.phys.angSize;meta.modelledfloatbeta? Fitted Moffat exponentarith.factor;meta.modelledfloatnullableNaper1Aperture numbermeta.codeintX1X-position of aperture 1pixpos.cartesian.x;instr.detfloatY1Y-position of aperture 1pixpos.cartesian.y;instr.detfloatXm1Measured aperture position (0,0) for aperture 1pixpos.cartesian.x;instr.detfloatYm1Invalid and/or linked apertures for aperture 1pixpos.cartesian.y;instr.detfloate_Xm1? 1-sigma uncertainty in measured aperture position for aperture 1pixstat.errorfloatnullablee_Ym1? (-1,-1) for invalid and/or linked apertures for aperture 1pixstat.errorfloatnullableCounts1Estimated target counts for aperture 1ctphot.countfloate_Counts1? 1-sigma uncertainty for aperture 1ctstat.errorfloatnullableSky1Sky background in counts for aperture 1ctphot.countfloatNSky1Number of sky pixels available for aperture 1meta.codeintNRej1Number of sky pixels rejected for aperture 1meta.codeintWorst1Value of worst bad pixel in aperture (0 OK) for aperture 1stat.fit.paraminterrorfl1Code for aperture 1 (1)meta.codeintNaper2Aperture numbermeta.codeintX2X-position of aperture 2pixpos.cartesian.x;instr.detfloatY2Y-position of aperture 2pixpos.cartesian.y;instr.detfloatXm2Measured aperture position (0,0) for aperture 2pixpos.cartesian.x;instr.detfloatYm2Invalid and/or linked apertures for aperture 2pixpos.cartesian.y;instr.detfloate_Xm2? 1-sigma uncertainty in measured aperture position for aperture 2pixstat.errorfloatnullablee_Ym2? (-1,-1) for invalid and/or linked apertures for aperture 2pixstat.errorfloatnullableCounts2Estimated target counts for aperture 2ctphot.countfloatSky2Sky background in counts for aperture 2ctphot.countfloatNSky2Number of sky pixels available for aperture 2meta.codeintNRej2? Number of sky pixels rejected for aperture 2meta.codeintnullableWorst2Value of worst bad pixel in aperture (0 OK) for aperture 2stat.fit.paraminterrorfl2Code for aperture 2 (1)meta.codeintJ/A+A/706/A41/run033Reduced data 17/05/2005, 09:55:48.00, ULTRACAM/VLTWorst1Value of worst bad pixel in aperture (0 OK) for aperture 1stat.fit.paraminterrorfl1Code for aperture 1 (1)meta.codeintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberFrame numbermeta.idintFlag[0/1] Time flag (1=OK,0=Not OK)meta.code.errorintNsatNumber satellitesmeta.numberintExpTimeExposure timestime.duration;obs.exposuredoubleCCD[1/3] CCD number (1=red,2=green,3=uv).meta.codeintFWHMFitted FWHM, =0 if no fit made.phys.angSize;meta.modelledfloatbeta? Fitted Moffat exponentarith.factor;meta.modelledfloatnullableNaper1Aperture numbermeta.codeintX1X-position of aperture 1pixpos.cartesian.x;instr.detfloatY1Y-position of aperture 1pixpos.cartesian.y;instr.detfloatXm1Measured aperture position (0,0) for aperture 1pixpos.cartesian.x;instr.detfloatYm1Invalid and/or linked apertures for aperture 1pixpos.cartesian.y;instr.detfloate_Xm1? 1-sigma uncertainty in measured aperture position for aperture 1pixstat.errorfloatnullablee_Ym1? (-1,-1) for invalid and/or linked apertures for aperture 1pixstat.errorfloatnullableCounts1Estimated target counts for aperture 1ctphot.countfloate_Counts1? 1-sigma uncertainty for aperture 1ctstat.errorfloatnullableSky1Sky background in counts for aperture 1ctphot.countfloatNSky1Number of sky pixels available for aperture 1meta.codeintNRej1Number of sky pixels rejected for aperture 1meta.codeintNaper2Aperture numbermeta.codeintX2X-position of aperture 2pixpos.cartesian.x;instr.detfloatY2Y-position of aperture 2pixpos.cartesian.y;instr.detfloatXm2Measured aperture position (0,0) for aperture 2pixpos.cartesian.x;instr.detfloatYm2Invalid and/or linked apertures for aperture 2pixpos.cartesian.y;instr.detfloate_Xm2? 1-sigma uncertainty in measured aperture position for aperture 2pixstat.errorfloatnullablee_Ym2? (-1,-1) for invalid and/or linked apertures for aperture 2pixstat.errorfloatnullableCounts2Estimated target counts for aperture 2ctphot.countfloate_Counts2? 1-sigma uncertainty for aperture 2ctstat.errorfloatnullableSky2Sky background in counts for aperture 2ctphot.countfloatNSky2Number of sky pixels available for aperture 2meta.codeintNRej2? Number of sky pixels rejected for aperture 2meta.codeintnullableWorst2Value of worst bad pixel in aperture (0 OK) for aperture 2stat.fit.paraminterrorfl2Code for aperture 2 (1)meta.codeintMJDModified Julian Date (UTC) centre of exposuredtime.epochdoubleindexedJ/A+A/706/A41/run039Reduced data 15/05/2005, 08:20:30.00, ULTRACAM/VLTWorst1Value of worst bad pixel in aperture (0 OK) for aperture 1stat.fit.paramintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberFrame numbermeta.idintFlag[0/1] Time flag (1=OK,0=Not OK)meta.code.errorintNsatNumber satellitesmeta.numberintExpTimeExposure timestime.duration;obs.exposuredoubleCCD[1/3] CCD number (1=red,2=green,3=uv).meta.codeintFWHMFitted FWHM, =0 if no fit made.phys.angSize;meta.modelledfloatbeta? Fitted Moffat exponentarith.factor;meta.modelledfloatnullableNaper1Aperture numbermeta.codeintX1X-position of aperture 1pixpos.cartesian.x;instr.detfloatY1Y-position of aperture 1pixpos.cartesian.y;instr.detfloatXm1Measured aperture position (0,0) for aperture 1pixpos.cartesian.x;instr.detfloatYm1Invalid and/or linked apertures for aperture 1pixpos.cartesian.y;instr.detfloate_Xm1? 1-sigma uncertainty in measured aperture position for aperture 1pixstat.errorfloatnullablee_Ym1? (-1,-1) for invalid and/or linked apertures for aperture 1pixstat.errorfloatnullableCounts1Estimated target counts for aperture 1ctphot.countfloate_Counts1? 1-sigma uncertainty for aperture 1ctstat.errorfloatnullableSky1Sky background in counts for aperture 1ctphot.countfloatNSky1Number of sky pixels available for aperture 1meta.codeintNRej1Number of sky pixels rejected for aperture 1meta.codeinterrorfl1Code for aperture 1 (1)meta.codeintNaper2Aperture numbermeta.codeintX2X-position of aperture 2pixpos.cartesian.x;instr.detfloatY2Y-position of aperture 2pixpos.cartesian.y;instr.detfloatXm2Measured aperture position (0,0) for aperture 2pixpos.cartesian.x;instr.detfloatYm2Invalid and/or linked apertures for aperture 2pixpos.cartesian.y;instr.detfloate_Xm2? 1-sigma uncertainty in measured aperture position for aperture 2pixstat.errorfloatnullablee_Ym2? (-1,-1) for invalid and/or linked apertures for aperture 2pixstat.errorfloatnullableCounts2Estimated target counts for aperture 2ctphot.countfloate_Counts2? 1-sigma uncertainty for aperture 2ctstat.errorfloatnullableSky2Sky background in counts for aperture 2ctphot.countfloatNSky2Number of sky pixels available for aperture 2meta.codeintNRej2? Number of sky pixels rejected for aperture 2meta.codeintnullableWorst2Value of worst bad pixel in aperture (0 OK) for aperture 2stat.fit.paraminterrorfl2Code for aperture 2 (1)meta.codeintMJDModified Julian Date (UTC) centre of exposuredtime.epochdoubleindexedJ/A+A/706/A41/run040Reduced data 15/05/2005, 08:29:39.00, ULTRACAM/VLTrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberFrame numbermeta.idintMJDModified Julian Date (UTC) centre of exposuredtime.epochdoubleindexedFlag[0/1] Time flag (1=OK,0=Not OK)meta.code.errorintNsatNumber satellitesmeta.numberintExpTimeExposure timestime.duration;obs.exposuredoubleCCD[1/3] CCD number (1=red,2=green,3=uv).meta.codeintFWHMFitted FWHM, =0 if no fit made.phys.angSize;meta.modelledfloatbeta? Fitted Moffat exponentarith.factor;meta.modelledfloatnullableNaper1Aperture numbermeta.codeintX1X-position of aperture 1pixpos.cartesian.x;instr.detfloatY1Y-position of aperture 1pixpos.cartesian.y;instr.detfloatXm1Measured aperture position (0,0) for aperture 1pixpos.cartesian.x;instr.detfloatYm1Invalid and/or linked apertures for aperture 1pixpos.cartesian.y;instr.detfloate_Xm1? 1-sigma uncertainty in measured aperture position for aperture 1pixstat.errorfloatnullablee_Ym1? (-1,-1) for invalid and/or linked apertures for aperture 1pixstat.errorfloatnullableCounts1Estimated target counts for aperture 1ctphot.countfloate_Counts1? 1-sigma uncertainty for aperture 1ctstat.errorfloatnullableSky1Sky background in counts for aperture 1ctphot.countfloatNSky1Number of sky pixels available for aperture 1meta.codeintNRej1Number of sky pixels rejected for aperture 1meta.codeintWorst1Value of worst bad pixel in aperture (0 OK) for aperture 1stat.fit.paraminterrorfl1Code for aperture 1 (1)meta.codeintNaper2Aperture numbermeta.codeintX2X-position of aperture 2pixpos.cartesian.x;instr.detfloatY2Y-position of aperture 2pixpos.cartesian.y;instr.detfloatXm2Measured aperture position (0,0) for aperture 2pixpos.cartesian.x;instr.detfloatYm2Invalid and/or linked apertures for aperture 2pixpos.cartesian.y;instr.detfloate_Xm2? 1-sigma uncertainty in measured aperture position for aperture 2pixstat.errorfloatnullablee_Ym2? (-1,-1) for invalid and/or linked apertures for aperture 2pixstat.errorfloatnullableCounts2Estimated target counts for aperture 2ctphot.countfloate_Counts2? 1-sigma uncertainty for aperture 2ctstat.errorfloatnullableSky2Sky background in counts for aperture 2ctphot.countfloatNSky2Number of sky pixels available for aperture 2meta.codeintNRej2? Number of sky pixels rejected for aperture 2meta.codeintnullableWorst2Value of worst bad pixel in aperture (0 OK) for aperture 2stat.fit.paraminterrorfl2Code for aperture 2 (1)meta.codeintJ/A+A/706/A41/run041Reduced data 15/05/2005, 10:03:30.00, ULTRACAM/VLTrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumberFrame numbermeta.idintMJDModified Julian Date (UTC) centre of exposuredtime.epochdoubleFlag[0/1] Time flag (1=OK,0=Not OK)meta.code.errorintNsatNumber satellitesmeta.numberintExpTimeExposure timestime.duration;obs.exposuredoubleCCD[1/3] CCD number (1=red,2=green,3=uv).meta.codeintFWHMFitted FWHM, =0 if no fit made.phys.angSize;meta.modelledfloatbeta? Fitted Moffat exponentarith.factor;meta.modelledfloatnullableNaper1Aperture numbermeta.codeintX1X-position of aperture 1pixpos.cartesian.x;instr.detfloatY1Y-position of aperture 1pixpos.cartesian.y;instr.detfloatXm1Measured aperture position (0,0) for aperture 1pixpos.cartesian.x;instr.detfloatYm1Invalid and/or linked apertures for aperture 1pixpos.cartesian.y;instr.detfloate_Xm1? 1-sigma uncertainty in measured aperture position for aperture 1pixstat.errorfloatnullablee_Ym1? (-1,-1) for invalid and/or linked apertures for aperture 1pixstat.errorfloatnullableCounts1Estimated target counts for aperture 1ctphot.countfloate_Counts1? 1-sigma uncertainty for aperture 1ctstat.errorfloatnullableSky1Sky background in counts for aperture 1ctphot.countfloatNSky1Number of sky pixels available for aperture 1meta.codeintNRej1Number of sky pixels rejected for aperture 1meta.codeintWorst1Value of worst bad pixel in aperture (0 OK) for aperture 1stat.fit.paraminterrorfl1Code for aperture 1 (1)meta.codeintNaper2Aperture numbermeta.codeintX2X-position of aperture 2pixpos.cartesian.x;instr.detfloatY2Y-position of aperture 2pixpos.cartesian.y;instr.detfloatXm2Measured aperture position (0,0) for aperture 2pixpos.cartesian.x;instr.detfloatYm2Invalid and/or linked apertures for aperture 2pixpos.cartesian.y;instr.detfloate_Xm2? 1-sigma uncertainty in measured aperture position for aperture 2pixstat.errorfloatnullablee_Ym2? (-1,-1) for invalid and/or linked apertures for aperture 2pixstat.errorfloatnullableCounts2Estimated target counts for aperture 2ctphot.countfloate_Counts2? 1-sigma uncertainty for aperture 2ctstat.errorfloatnullableSky2Sky background in counts for aperture 2ctphot.countfloatNSky2Number of sky pixels available for aperture 2meta.codeintNRej2? Number of sky pixels rejected for aperture 2meta.codeintnullableWorst2Value of worst bad pixel in aperture (0 OK) for aperture 2stat.fit.paraminterrorfl2Code for aperture 2 (1)meta.codeint