J/AJ/155/162ivo://CDS.VizieR/J/AJ/155/162doi:10.26093/cds/vizier.51550162CDSBohlin R.C.Bianchi L.2019-01-07T09:02:22Z2018-11-27T12:43:14ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsspectroscopyultraviolet-astronomyA collection of spectral energy distributions (SEDs) is available in the Hubble Space Telescope (HST) CALSPEC database that is based on calculated model atmospheres for pure hydrogen white dwarfs (WDs). A much larger set (~100000) of UV SEDs covering the range (1150-3350 {AA}) with somewhat lower quality are available in the IUE database. IUE low-dispersion flux distributions are compared with CALSPEC to provide a correction that places IUE fluxes on the CALSPEC scale. While IUE observations are repeatable to only 4%-10% in regions of good sensitivity, the average flux corrections have a precision of 2%-3%. Our re-calibration places the IUE flux scale on the current UV reference standard and is relevant for any project based on IUE archival data, including our planned comparison of GALEX to the corrected IUE fluxes. IUE SEDs may be used to plan observations and cross-calibrate data from future missions, so the IUE flux calibration must be consistent with HST instrumental calibrations to the best possible precision.2018AJ....155..162Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/155/162CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/119/207 : IUE echelle spectra of hot white dwarfs (Holberg+, 1998)J/ApJS/147/145 : IUE low-dispersion spectra of white dwarfs (Holberg+, 2003)http://www.stsci.edu/hst/observatory/crds/calspec.html : CALSPEC databasehttp://archive.stsci.edu/iue/ : Mikulski Archive for Space Telescopes (MAST)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/155/162https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/155/162http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/155/162https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/155/162https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/155/162http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/155/162GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/155/162/table1 (Low-dispersion IUE data used for comparing IUE and CALSPEC SEDs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/155/162/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/155/162/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/155/162/table1?GETtext/xml+votable180.050000true76.377583352.83108330.0055555555555555566/1890 10386 11984 23789 28026 28538https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/155/162?format=asciiUVdefaultJ/AJ/155/162/table1Low-dispersion IUE data used for comparing IUE and CALSPEC SEDsSimbadNameSimbad column added by the CDSmeta.idcharspspectrummeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDWD identifiermeta.id;meta.maincharprimarymoreindicates IUE SEDs data in Table 3meta.ref.urlcharRAJ2000Simbad Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad Degree of Declination (J2000)pos.eq.dec;meta.mainVmag[11.78/14.69] V band magnitudemagphot.mag;em.opt.VfloatCALSPECCALSPEC namemeta.id;meta.filecharSWP[10/56] Number of good IUE observations for IUE/SWP camera (in the FUV)meta.numberintLWP[1/39] Number of good IUE observation(s) for IUE/LWP camera (in the NUV)meta.numberintLWR[1/10] Number of good IUE observation(s) for IUE/LWR camera (in the NUV)meta.numberintJ/AJ/155/162/table2Multiplicative correction for IUE NEWSIPS fluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWave-SW[1145/1985] IUE/SWP wavelength ({AA})0.1nmem.wlfloatCorr-SW[1.013/1.101] IUE/SWP correction factorinstr.paramfloatWave-LW[1850/3350]? IUE/LWP/R wavelength ({AA})0.1nmem.wlfloatnullableCorr-LWP[1.01/1.097]? IUE/LWP correction factorinstr.paramfloatnullableCorr-LWR[1.042/1.158]? IUE/LWR correction factorinstr.paramfloatnullableJ/AJ/155/162/table3IUE SEDs for all six starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDWD identifiermeta.id;meta.maincharWave[1152.26/3346.83] Wavelength ({AA})0.1nmem.wlfloatNetavg[-0.01373/12.05] Average net signal (1)s**-1phot.fluxdoubleFluxavg[-2.834e-13/1.963e-11] Average flux (in erg/s/cm^2^/{AA})cW.m**-2.nm**-1phot.flux;stat.meandoubleBkg[-0.1135/3.651] Background signal (1)s**-1phot.fluxdoubleSigma[0/3.365e-13] Formal propagated uncertainty as the error-in-the-mean (in erg/s/cm^2^/{AA})cW.m**-2.nm**-1stat.errordoubleNobs[1/56] Number of observation(s) averagedmeta.numberfloatTexp[419.7/38514.8] Total exposure timestime.duration;obs.exposurefloatRMS[0/96.11]? RMS scatter among observations%stat.errorfloatnullable