J/A+AS/140/309ivo://CDS.VizieR/J/A+AS/140/309CDSFabrika S.Sholukhova O.2017-09-20T05:13:42Z2010-11-09T21:05:29ZCDS support team

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

cds-question@unistra.frgalaxiesearly-type-starsFor the purposes of a search for SS433 type objects, LBV stars and hypergiants in M33, we have carried out a photometry of blue stars in H{alpha} images of this galaxy. From 2332 listed OB stars, we have isolated 549 objects, which have H{alpha} excess over stars of the same V magnitude. Among them 81 emission stars (s) have been selected. About 60% of isolated objects found to be extended in H{alpha}, among them 154 diffuse (d) and 180 bubble-type (b) nebulae. 117 objects are compact (c) and faint H{alpha} sources. These groups are different in colour indices, H{alpha} fluxes, surface brightness and sizes. The most probable size of the H{alpha} nebulae is FWHM=10-14pc. There is evidence that their properties and location in the galaxy are defined by interstellar gas pressure and related to spiral arms. The d objects are HII regions with an embedded star. The b objects are probably envelopes around WR stars or SN remnants. Among s-type objects we isolated a group of 20 brightest stars, which in their average properties fit well to the parameters of blue hypergiants or LBV-type stars. The stars of intermediate brightness follow very well to blue Ia supergiants. The interstellar absorption derived from brightest H{alpha} stars is A_V_=0.93+/-0.05mag. We classify the faintest stars as blue Ib supergiants, their average absorption is A_V_~0.6mag. They are restricted in number by the limiting stellar magnitude in the original sample.1999A&AS..140..309Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/140/309CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/89/85 : Blue and red supergiants in M33 (Ivanov+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/140/309https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/140/309http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/140/309https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/140/309https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/140/309http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/140/309GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/140/309/table1 (Selected emission objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/140/309/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/140/309/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/140/309/table1?GETtext/xml+votable180.050000true23.121930.570.0055555555555555566/2154-2155 2240-2241https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/140/309?format=asciiOpticaldefaultJ/A+AS/140/309/table1Selected emission objectsVmagV magnitudemagphot.mag;em.opt.VfloatSH{alpha} excess parameterphot.fluxfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFSZ[1/549] Sequential numbermeta.recordintIFM-BNumber of Ivanov et al., Cat. <J/ApJS/89/85>meta.idintDiam? Diameter (objects too close to bright HII regions could not be determined)arcsecphys.angSizefloatnullableMorphMorphological type (1)meta.code;src.morphcharSimbadSimbad column added by the CDSchar_RAPositions from Ivanov et al. 1993, J/ApJS/89/85 (3 stars do not exist in Ivanov: 10, 385, 2143) (right ascension part)degpos.eq.ra;meta.mainnullable_DEPositions from Ivanov et al. 1993, J/ApJS/89/85 (3 stars do not exist in Ivanov: 10, 385, 2143) (declination part)degpos.eq.dec;meta.mainnullable