J/A+A/250/370ivo://CDS.VizieR/J/A+A/250/370doi:10.26093/cds/vizier.32500370CDSBixler J.V.Bowyer S.Laget M.2013-02-27T06:27:42Z1999-02-26T14:41:26ZCDS support team

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

cds-question@unistra.frspectroscopyultraviolet-astronomysubdwarf-starsphotometryOptical spectra have been obtained for a selection of objects included in a catalog of far ultraviolet bright, high galactic latitude objects detected with a balloon-borne survey telescope. The observed objects provide a sample of subdwarf O and B stars, white dwarfs, and binary systems including a hot sub-luminous member. Model atmospheres analysis of the sub-dwarf sample is used to determine the temperature, gravity, and helium to hydrogen ratio of the individual objects. A smooth distribution of objects is found on the gravity versus temperature diagram near the theoretical location of the extended horizontal branch. A break between the helium rich and helium poor objects occurs at 40000K. Suspected binary objects were found and analyzed to determine the temperature and gravity of the hot subluminous member in each system. The number of subdwarf stars contained in binaries is determined to be from 65% to 100%. The number versus ultraviolet magnitude distribution of the subdwarf B sample is modeled to obtain a midplane density of 3.3x10^-6^pc^-3^ and a population scale height of 240pc. The proportion of white dwarfs that experience the subdwarf phase of evolution is found to be 0.94%.1991A&A...250..370Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/250/370CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/207: Palomar-Green catalog UV-excess stellar objects (Green+ 1986)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/250/370https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/250/370http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/250/370https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/250/370https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/250/370http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/250/370GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/250/370/appena (Coordinates of optically observed objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/250/370/appena?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/250/370/appena?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/250/370/appena?GETtext/xml+votable180.050000true10.687643.30720.005555555555555556Cone search capability for table J/A+A/250/370/appenf (UV (200nm, 12nm FWHM) magnitude of subdwarf B stars identified in Palomar Green (Cat. <II/207>) survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/250/370/appenf?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/250/370/appenf?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/250/370/appenf?GETtext/xml+votable180.050000true1.642213.5950.0055555555555555566/2620 2753 5584 5586 6070 6113 8192 8196 8208 8500 8510 8670-8671 8701 9427 9429 9433 9436 9461 9602 9610 9649 9991 9993 10011 10315 10322 10378-10379 10382 10400 10474-10475 10636 10639 10674 10895 10919 10936 10969 10973 10992 11029 11031 11038 11144 11176 11372 11375 11409 12377 12403 12407 12577 12585 13319 13336 13392 13405 18027 18031 18372 18418 18796 18938 18940 19590 19626 19672 19874 19970 20147 20165 20184 20187 20218-20219 20223 20383 25874 25884 26218 26223 26258 26262 26289 26292 26297 26299 26312 26603 27859 27871 27905 27913 27934 27975 27999 28221-28222 28267 28622 28631 28638 30053 30061 31405 31411 31419-31420 31554 44974 44978 449869.932213243108895e-19 9.932213243108895e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/250/370?format=asciiUVOpticaldefaultJ/A+A/250/370/table3Composite star candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDBallon identificationmeta.id;meta.mainlongprimaryFigFigure numbermeta.idintymagy magnitudemagphot.mag;em.opt.Vfloatn_ymag[a] See note (1)meta.notecharm(UV)-bm(UV)-b color index (2)magphot.color;em.UV;em.optfloatn_m(UV)-b[b] b: Anomalously large colormeta.notecharb-yb-y color indexmagphot.color;em.opt.B;em.opt.Vfloatn_b-y[a] See note (1)meta.notecharf(6750)/f(5450)f_{lambda}_(6750)/f_{lambda}_(5450) ratiometa.notefloatJ/A+A/250/370/appenaCoordinates of optically observed objectsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDBalloon numbermeta.id;meta.mainlongprimaryRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.main_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/A+A/250/370/appencSubdwarf B parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDBalloon numbermeta.id;meta.mainlongprimarym(UV)? m(UV) magnitude (200nm, 12nm FWHM)magphot.mag;em.UV.200-300nmfloatnullableymagy magnitudemagphot.mag;em.opt.Vfloatb-yb-y color indexmagphot.color;em.opt.B;em.opt.VfloatD[0.1]HbH{beta} line width0.1nmspect.line.width;em.line.HbetafloatD[0.1]HgH{gamma} line width0.1nmspect.line.width;em.line.HgammafloatEWHbH{beta} equivalent width0.1nmspect.line.eqWidth;em.line.HbetafloatEWHgH{gamma} equivalent width0.1nmspect.line.eqWidth;em.line.HgammafloatRHbH{beta} line depth0.1nmphys.absorption.opticalDepth;spect.linefloatRHgH{gamma} line depth0.1nmphys.absorption.opticalDepth;spect.linefloatloggSurface gravitylog(cm.s**-2)phys.gravityfloatTeffEffective temperatureKphys.temperature.effectiveintl_EWHeIaLimit flag on EWHeIameta.code.errorcharEWHeIaHe I 4471A equivalent width0.1nmspect.line.eqWidthfloatl_EWHeIbLimit flag on EWHeIbmeta.code.errorcharEWHeIbHe I 4922A equivalent width0.1nmspect.line.eqWidthfloatl_EWHeIILimit flag on EWHeIImeta.code.errorcharEWHeIIHe II 4686A equivalent width0.1nmspect.line.eqWidthfloate_EWrms uncertainty on EW measurements0.1nmstat.error;spect.line.eqWidthfloatl_He/HLimit flag on He/Hmeta.code.error;phys.abund.YcharHe/HHe/H ratiophys.abundfloatComComments (1)meta.notecharJ/A+A/250/370/appendSubdwarf O parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDBalloon numbermeta.id;meta.mainlongprimarym(UV)m(UV) magnitude (200nm, 12nm FWHM)magphot.mag;em.UV.200-300nmfloatymagy magnitudemagphot.mag;em.opt.Vfloatb-yb-y color indexmagphot.color;em.opt.B;em.opt.Vfloatl_EWHeIaLimit flag on EWHeIameta.code.errorcharEWHeIaHe I 4388A equivalent widthspect.line.eqWidthfloatl_EWHeIbLimit flag on EWHeIbmeta.code.errorcharEWHeIbHe I 4471A equivalent widthspect.line.eqWidthfloatl_EWHeIcLimit flag on EWHeIcmeta.code.errorcharEWHeIcHe I 4921A equivalent widthspect.line.eqWidthfloatl_H/HeIIaLimit flag on H/HeIIameta.code.errorcharH/HeIIaH/He II 4200 A ratiophys.abund;arith.ratiofloatl_H/HeIIbLimit flag on H/HeIIbmeta.code.errorcharH/HeIIbH/He II 4340 A ratiophys.abund;arith.ratiofloatl_H/HeIIcLimit flag on H/HeIIcmeta.code.errorcharH/HeIIcH/He II 4542 A ratiophys.abund;arith.ratiofloatl_H/HeIIdLimit flag on H/HeIIdmeta.code.errorcharH/HeIIdH/He II 4686 A ratiophys.abund;arith.ratiofloatH/HeIIeH/He II 4861 A ratiophys.abund;arith.ratiofloatl_H/HeIIfLimit flag on H/HeIIfmeta.code.errorcharH/HeIIfH/He II 5412 A ratiophys.abund;arith.ratiofloatJ/A+A/250/370/appeneWhite dwarf parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDBalloon numbermeta.id;meta.mainlongprimarym(UV)? m(UV) magnitude (200nm, 12nm FWHM)magphot.mag;em.UV.200-300nmfloatnullableymagy magnitudemagphot.mag;em.opt.VfloatD[0.1]Hb? H{beta} line width0.1nmspect.line.width;em.line.HbetafloatnullableD[0.1]Hg? H{gamma} line width0.1nmspect.line.width;em.line.HgammafloatnullableEWHbH{beta} equivalent width0.1nmspect.line.eqWidth;em.line.HbetafloatEWHgH{gamma} equivalent width0.1nmspect.line.eqWidth;em.line.HgammafloatRHbH{beta} line depth0.1nmphys.absorption.opticalDepth;spect.linefloatRHgH{gamma} line depth0.1nmphys.absorption.opticalDepth;spect.linefloatlogg? Surface gravitylog(cm.s**-2)phys.gravityfloatnullableTeff? Effective temperatureKphys.temperature.effectiveintnullableJ/A+A/250/370/appenfUV (200nm, 12nm FWHM) magnitude of subdwarf B stars identified in Palomar Green (Cat. <II/207>) surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1950Right ascension 1950pos.eq.ra;meta.mainDE1950Declination 1950pos.eq.dec;meta.mainIDBalloon numbermeta.id;meta.mainlongprimarym(UV)m(UV) magnitude (200nm, 12nm FWHM)magphot.mag;em.UV.200-300nmfloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed