J/A+A/428/149ivo://CDS.VizieR/J/A+A/428/149doi:10.26093/cds/vizier.34280149CDSSchroeder S.E.Kaper L.Lamers H.J.G.L.M.Brown A.G.A.2018-01-05T08:55:52Z2006-05-03T18:52:48ZCDS support team

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

cds-question@unistra.fro-starsvisible-astronomytrigonometric-parallaxabsolute-magnitudemorgan-keenan-classificationWe compare the absolute visual magnitude of the majority of bright O stars in the sky as predicted from their spectral type with the absolute magnitude calculated from their apparent magnitude and the Hipparcos parallax. We find that many stars appear to be much fainter than expected, up to five magnitudes. We find no evidence for a correlation between magnitude differences and the stellar rotational velocity as suggested for OB stars by Lamers et al. (1997A&A...325L..25L), whose small sample of stars is partly included in ours.2004A&A...428..149Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/428/149CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/428/149https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/428/149http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/428/149https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/428/149https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/428/149http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/428/149GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/428/149/table1 (Characteristics of the O star sample.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/428/149/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/428/149/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/428/149/table1?GETtext/xml+votable180.050000true1.514108963.67965640.005555555555555556Cone search capability for table J/A+A/428/149/table2 (Characteristics of the B stars in the sample of Lamers et al., 1997A&A...325L..25L depicted in Fig. 5.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/428/149/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/428/149/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/428/149/table2?GETtext/xml+votable180.050000true55.594361433.96502640.0055555555555555566/1293 1332 1550 1558 1790 2409 2806 3011 3066 3214 3245 3261 3283 3301 3307 3312 3384 3430 6891 12943 13255 13281 13557 13999 14008 14179 14240 14263 14456 14630-14632 14636 14643 14646-14647 14653-14654 14712 14745 14788 14824 15369 15476 15486 15625 15631 15656 15672 15683 15745 20613 21438 21635 21647 21655-21656 22033 22211 22216 22240 22249 22253 22517 22790 22854 22884 22911 23007 23637 23717 23780 23982 24179 24496 28809 28833 28890-28892 28900 28913 28915 29025 29036 29089 29091 29095 29098 29115 29190 29467 29513 30818 37316 37833 37896-37897 37901 37926 37948 38016 38074 39216 39238 39248 39252 39254 39264 39281 39327 39374 39733 39873 39916 39971 41103 41598-41599 41610 41655 41673 41692 41747 41750 42214 42236 42283 42303 42394 42405 42407-42408 42416-42417 42421 42464 42470 42483 42764 42948 43041 43062 44360 44389https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/428/149?format=asciiOpticaldefaultJ/A+A/428/149/table1Characteristics of the O star sample.HDHD numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpTypeMK spectral typesrc.spTypecharr_SpTypeReference for SpType, when not Mason et al., 1998AJ....115..821Mmeta.bibintplxHipparcos parallax, corrected for interstellar extinction (AV)maspos.parallaxfloate_plxrms uncertainty on plxmasstat.error;pos.parallaxfloatAVInterstellar extinctionmagphys.absorptionfloatVMAGH? Hipparcos absolute magnitudemagphys.magAbsfloatnullableVMAGSKPredicted absolute magnitude, derived from the spectral type according to the calibration of Schmidt-Kaler et al. (G1)magphys.magAbsfloatHIPShow the Hipparcos datameta.ref.urlcharSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/428/149/table2Characteristics of the B stars in the sample of Lamers et al., 1997A&A...325L..25L depicted in Fig. 5.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD numbermeta.id;meta.mainintSpTypeMK spectral typesrc.spTypecharr_SpType? Reference for SpType and vsinimeta.bibintnullableplxHipparcos parallax, corrected for interstellar extinction (AV) and the presence of spectroscopic companions.maspos.parallaxfloate_plxrms uncertainty on plxmasstat.error;pos.parallaxfloatVMAGH? Hipparcos absolute magnitudemagphys.magAbsfloatnullableVMAGSKPredicted absolute magnitude, derived from the spectral type according to the calibration of Schmidt-Kaler et al. (G1) (1)magphys.magAbsfloatvsiniRotation velocitykm/sphys.veloc.rotatintHIPShow the Hipparcos datameta.ref.urlcharSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/428/149/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.noteintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorchar