J/ApJS/61/569ivo://CDS.VizieR/J/ApJS/61/569doi:10.26093/cds/vizier.20610569CDSDownes R.A.2017-12-06T07:39:02Z2011-01-02T15:21:17ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starssubdwarf-starsstellar-spectral-typesvisible-astronomyWide-band photometryA survey for ultraviolet-excess objects has been performed for over about 1000sq.deg of the Galactic plane. Photographic blue and ultraviolet plates were obtained to select ultraviolet-excess candidates, and spectroscopic observations were used to determine the nature of those objects. Over 70 white dwarfs and subdwarfs were identified from the survey plates, and these objects were analyzed statistically to determine scale heights and space densities. The sample was complete to B=15.3mag, with the space density of white dwarfs for Mv<12.25 equal to 0.72+/-0.25 per 1000pc^3^, slightly higher than that from the Palomar-Green survey. The average absolute magnitude determined for both the subdwarf O and the subdwarf B stars was considerably fainter than previous determinations, while the scale height for the subdwarfs was lower than earlier suggested values. The space density for the subdwarf O stars is about 7x10^-7^pc^-3^, while the value for the subdwarf B stars is about 2x10^-6^pc^-3, both values considerably higher than previous estimates. The space densities can be used to place evolutionary constraints on these objects.1986ApJS...61..569Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/61/569CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/106 : Kiso Ultraviolet Catalog (KUV) (Noguchi+ 1980-1984)II/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/ApJS/61/569https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/61/569http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/61/569https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/61/569https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/61/569http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/61/569GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/61/569/kpd (White dwarfs (table 3), sdO (table 6) and B (table 8))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/61/569/kpd?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/61/569/kpd?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/61/569/kpd?GETtext/xml+votable180.050000true2.075708351.38794440.0055555555555555566/1307 1617 1650 1724 1932 1957 2809 2868 2877 2912 2913 2958 2965 2973 2981 3094 3129 3301 3345 12910 12911 12922 12996 13009 13249 13250 13263 13266 13283 13286 13806 13812 13923 13930 13961 13998 13999 14016 14110 14111 14125 14126 14135 14148 14149 14217 14220 14231 14233 14396 14440 14466 14485 14594 14667 14669 14672 14756 14764 14770 14793 14824 14832 15391 15411 15462 15474 15502 15504 15525 15560 21931 22100 22102 22169 22304 23644 23789 23795 23802 23804 23806 23845 24148 24150 30406 30617 30643 30696 32072 322093.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/61/569?format=asciiOpticaldefaultJ/ApJS/61/569/kpdWhite dwarfs (table 3), sdO (table 6) and B (table 8)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKPDKPD source name (HHMM+DDMM, B1950 equinox)meta.id;meta.maincharRAJ2000Right Ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mains[BbCgLMU] Source of position (1)meta.ref;pos.framecharVmagJohnson V magnitude (2)magphot.mag;em.opt.VfloatB-V? B-V color index (2)magphot.color;em.opt.B;em.opt.VfloatnullableU-BU-B color index (2)magphot.color;em.opt.U;em.opt.BfloatSpTSpectral typesrc.spTypecharRemNotes and remarks, by B. Skiffmeta.notecharSimbadSimbad column added by the CDSchar