J/MNRAS/335/291ivo://CDS.VizieR/J/MNRAS/335/291doi:10.26093/cds/vizier.73350291CDSNaylor T.Totten E.J.Jeffries R.D.Pozzo M.Devey C.R.Thompson S.A.2024-06-28T20:16:49Z2003-01-16T20:58:13ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryvisible-astronomybroad-band-photometryWe have developed the techniques required to use Naylor's optimal photometry algorithm of to create colour-magnitude diagrams with well-defined completeness functions. To achieve this we first demonstrate that the optimal extraction is insensitive to uncertainties in the measured position of the star. We then show how to correct the optimally extracted fluxes such that they correspond to those measured in a large aperture, so aperture photometry of standard stars can be used to place the measurements on a standard system. The technique simultaneously removes the effects of a position-dependent point spread function. Finally, we develop a method called 'ghosting', which calculates the completeness corrections in the absence of an accurate description of the point spread function. We apply these techniques to the young cluster NGC 2547 (=C0809-491), and use an X-ray-selected sample to find an age of 20-35Myr and an intrinsic distance modulus of 8.00-8.15mag. We use these isochrones to select members from our photometric surveys. Our derived luminosity function shows a well-defined Wielen dip, making NGC 2547 the youngest cluster in which such a feature has been observed. Our derived mass function spans the range 0.1-6M_{sun}_ and is similar to that for the field and the older, more massive clusters M35 and the Pleiades, supporting the idea of a universal initial mass function.2002MNRAS.335..291Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/335/291CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/335/291https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/335/291http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/335/291https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/335/291https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/335/291http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/335/291GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/335/291/table2 (Combined catalogue entries for stars also in Claria (1982A&AS...47..323C))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/335/291/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/335/291/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/335/291/table2?GETtext/xml+votable180.050000true122.5855417-49.23695830.005555555555555556Cone search capability for table J/MNRAS/335/291/table3 (Deep catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/335/291/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/335/291/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/335/291/table3?GETtext/xml+votable180.050000true122.2280417-49.20701940.005555555555555556Cone search capability for table J/MNRAS/335/291/table4 (Wide catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/335/291/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/335/291/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/335/291/table4?GETtext/xml+votable180.050000true122.1296667-49.48034170.005555555555555556Cone search capability for table J/MNRAS/335/291/table5 (Combined catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/335/291/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/335/291/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/335/291/table5?GETtext/xml+votable180.050000true122.1296667-49.48034170.005555555555555556Cone search capability for table J/MNRAS/335/291/table6 (D'Antona & Mazzitelli (1997MmSAI..68..807D) model)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/335/291/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/335/291/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/335/291/table6?GETtext/xml+votable180.050000true122.23995833-49.190655560.005555555555555556Cone search capability for table J/MNRAS/335/291/table7 (Siess et al. (2000A&A...358..593S) model)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/335/291/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/335/291/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/335/291/table7?GETtext/xml+votable180.050000true122.24420833-49.148680560.0055555555555555566/39181 39183 39192https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/335/291?format=asciiOpticalInfrareddefaultJ/MNRAS/335/291/table2Combined catalogue entries for stars also in Claria (1982A&AS...47..323C)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClaria? Claria (1982A&AS...47..323C) number, NGC 2547 NNN in Simbad (only in table2.dat)meta.id.crossintnullableFieldField numberobs.fieldintStarStar number in the fieldmeta.id.part;meta.mainintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainXposX position in the CCD imagepixpos.cartesian.x;instr.detdoubleYpoxY position in the CCD imagepixpos.cartesian.y;instr.detdoubleVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatf_VmagFlag on Vmag (1)meta.code.errorintB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.errorfloatf_B-VFlag on B-V colour (1)meta.code.errorintV-IcV-Ic colour indexmagphot.color;em.opt.V;em.opt.Idoublee_V-Icrms uncertainty on V-Icmagstat.errorfloatf_V-IcFlag on V-Ic colour (1)meta.code.errorintJ/MNRAS/335/291/table3Deep catalogf_VmagFlag on Vmag (1)meta.code.errorintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClaria? Claria (1982A&AS...47..323C) number, NGC 2547 NNN in Simbad (only in table2.dat)meta.id.crossintnullableFieldField numberobs.fieldintStarStar number in the fieldmeta.id.part;meta.mainintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainXposX position in the CCD imagepixpos.cartesian.x;instr.detdoubleYpoxY position in the CCD imagepixpos.cartesian.y;instr.detdoubleVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.errorfloatf_B-VFlag on B-V colour (1)meta.code.errorintV-IcV-Ic colour indexmagphot.color;em.opt.V;em.opt.Idoublee_V-Icrms uncertainty on V-Icmagstat.errorfloatf_V-IcFlag on V-Ic colour (1)meta.code.errorintJ/MNRAS/335/291/table4Wide catalogFieldField numberobs.fieldintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClaria? Claria (1982A&AS...47..323C) number, NGC 2547 NNN in Simbad (only in table2.dat)meta.id.crossintnullableStarStar number in the fieldmeta.id.part;meta.mainintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainindexedXposX position in the CCD imagepixpos.cartesian.x;instr.detdoubleYpoxY position in the CCD imagepixpos.cartesian.y;instr.detdoubleVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatf_VmagFlag on Vmag (1)meta.code.errorintB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.errorfloatf_B-VFlag on B-V colour (1)meta.code.errorintV-IcV-Ic colour indexmagphot.color;em.opt.V;em.opt.Idoublee_V-Icrms uncertainty on V-Icmagstat.errorfloatf_V-IcFlag on V-Ic colour (1)meta.code.errorintJ/MNRAS/335/291/table5Combined catalogClaria? Claria (1982A&AS...47..323C) number, NGC 2547 NNN in Simbad (only in table2.dat)meta.id.crossintnullableFieldField numberobs.fieldintStarStar number in the fieldmeta.id.part;meta.mainintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainindexedXposX position in the CCD imagepixpos.cartesian.x;instr.detdoubleYpoxY position in the CCD imagepixpos.cartesian.y;instr.detdoubleVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatf_VmagFlag on Vmag (1)meta.code.errorintB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.errorfloatf_B-VFlag on B-V colour (1)meta.code.errorintV-IcV-Ic colour indexmagphot.color;em.opt.V;em.opt.Idoublee_V-Icrms uncertainty on V-Icmagstat.errorfloatf_V-IcFlag on V-Ic colour (1)meta.code.errorintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/MNRAS/335/291/table6D'Antona & Mazzitelli (1997MmSAI..68..807D) modelrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField numberobs.fieldintStarStar number in the fieldmeta.id.part;meta.mainintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainfmemb1[0/1] Membership flag in V vs B-V (1)meta.code.memberintfmemb2[0/1] Membership flag in V vs V-I (1)meta.code.memberintfmemb3[0/1] Membership flag in B-V vs V-I (1)meta.code.memberintfmemb4[0/1] Membership flag for binary (2)meta.code.memberintJ/MNRAS/335/291/table7Siess et al. (2000A&A...358..593S) modelrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField numberobs.fieldintStarStar number in the fieldmeta.id.part;meta.mainintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainfmemb1[0/1] Membership flag in V vs B-V (1)meta.code.memberintfmemb2[0/1] Membership flag in V vs V-I (1)meta.code.memberintfmemb3[0/1] Membership flag in B-V vs V-I (1)meta.code.memberintfmemb4[0/1] Membership flag for binary (2)meta.code.memberint