J/ApJ/771/110ivo://CDS.VizieR/J/ApJ/771/110doi:10.26093/cds/vizier.17710110CDSMooley K.Hillenbrand L.Rebull L.Padgett D.Knapp G.2018-01-02T13:42:55Z2015-02-18T08:48:01ZCDS support team

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

cds-question@unistra.frradial-velocitya-starsproper-motionsstellar-spectral-typesstellar-distanceWe describe the results of a search for early-type stars associated with the Taurus-Auriga molecular cloud complex, a diffuse nearby star-forming region noted as lacking young stars of intermediate and high mass. We investigate several sets of possible O, B, and early A spectral class members. The first is a group of stars for which mid-infrared images show bright nebulae, all of which can be associated with stars of spectral-type B. The second group consists of early-type stars compiled from (1) literature listings in SIMBAD, (2) B stars with infrared excesses selected from the Spitzer Space Telescope survey of the Taurus cloud (Rebull et al. 2010, J/ApJS/186/259), (3) magnitude- and color-selected point sources from the Two Micron All Sky Survey (Skrutskie et al. 2006, VII/233), and (4) spectroscopically identified early-type stars from the Sloan Digital Sky Survey coverage of the Taurus region (Finkbeiner et al. 2004AJ....128.2577F; Knapp et al. 2007AAS...211.2907K). We evaluated stars for membership in the Taurus-Auriga star formation region based on criteria involving: spectroscopic and parallactic distances, proper motions and radial velocities, and infrared excesses or line emission indicative of stellar youth. For selected objects, we also model the scattered and emitted radiation from reflection nebulosity and compare the results with the observed spectral energy distributions to further test the plausibility of physical association of the B stars with the Taurus cloud. This investigation newly identifies as probable Taurus members three B-type stars: HR 1445 (HD 28929), {tau} Tau (HD 29763), 72 Tau (HD 28149), and two A-type stars: HD 31305 and HD 26212, thus doubling the number of stars A5 or earlier associated with the Taurus clouds. Several additional early-type sources including HD 29659 and HD 283815 meet some, but not all, of the membership criteria and therefore are plausible, though not secure, members.2013ApJ...771..110Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/771/110CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)VII/244 : Atlas and Catalog of Dark Clouds (Dobashi+, 2005)III/23 : MK Classification for OB Stars (Lesh 1968)J/ApJS/196/4 : New young star candidates in Taurus-Auriga (Rebull+, 2011)J/ApJ/731/8 : Multiple star formation in Taurus-Auriga (Kraus+, 2011)J/ApJ/727/64 : Young stellar groups & their most massive stars (Kirk+, 2011)J/A+A/519/A83 : T Tau stars toward the Taurus-Auriga region (Takita+ 2010)J/ApJS/186/259 : Taurus Spitzer survey: new candidate members (Rebull+, 2010)J/ApJ/647/1180 : Infrared photometry of Taurus SFR (Luhman+, 2006)J/A+A/446/485 : New very low-mass members in Taurus (Guieu+, 2006)J/A+A/438/769 : Pre-main sequence stars Proper Motion Cat. (Ducourant+, 2005)J/ApJ/573/359 : Rotational velocities of B stars from BSC (Abt+, 2002)J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)J/A+A/325/647 : High-resolution spectra south of Taurus (Neuhaeuser+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/771/110https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/771/110http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/771/110https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/771/110https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/771/110http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/771/110GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/771/110/table3 (List of candidate early-type stars with various selection methods)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/771/110/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/771/110/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/771/110/table3?GETtext/xml+votable180.050000true60.0363888929.710836110.005555555555555556Cone search capability for table J/ApJ/771/110/table6 (Final List of early-type stars showing indications of membership with Taurus)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/771/110/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/771/110/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/771/110/table6?GETtext/xml+votable180.050000true70.5612522.95691670.0055555555555555565/259 261 262 263 267 268 270 271 272 273 274 278 280 282 289 292 293 6/374 375 382 383 465 1030 1031 1034 1040 1041 1043 1056 1058 1060 1063 1065 1066 1067 1077 1078 1079 1101 1102 1103 1124 1125 1127 1133 1136 1152 1161 1163 1166 1176 1177 1179 1180 1182 1189 1190 1191 1200 1202 1216 1217 1218 24246 24247 24251 24252 24253 24290 24296 24297 24298 24302https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/771/110?format=asciiOpticaldefaultJ/ApJ/771/110/table3List of candidate early-type stars with various selection methodsSimbadNameSimbad column added by the CDSmeta.idcharNameStar namemeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroupStar grouping (G1)meta.codecharSeqRunning index numbermeta.idintSNumber of spectroscopic measurement in table 4meta.numberintnullableMSimbad column added by the CDSmeta.ref.urlcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maindHIP[82/667]? Hipparcos derived distancepcpos.distance;pos.heliocentricintnullablee_dHIP? Lower limit uncertainty in dHIPpcstat.errorintnullableE_dHIP? Upper limit uncertainty in dHIPpcstat.error;stat.maxintnullabledSpec[16/22508]? Spectroscopic derived distancepcpos.distance;pos.heliocentricintnullablee_dSpec? Uncertainty in dSpec (1)pcstat.errorintnullablepmRA[-35/38] Proper motion along RA; times cos(DE)mas/yrpos.pm;pos.eq.rafloate_pmRAUncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-41/5.4] Proper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmDEUncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatHRV[-169/206]? Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HRV[0.9/13]? Uncertainty in HRVkm/sstat.errorfloatnullableSpTMK spectral type (2)src.spTypechardCCandidate based on distance? (3)meta.codecharkCCandidate based on kinematic assessments? (4)meta.codechar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246) within 3"meta.ref.urlcharJ/ApJ/771/110/table4Spectral types derived through new spectroscopyf_EWNIIFlag on EWNII (1)meta.codecharl_EWHe1Limit flag on EWHe1meta.code.errorcharf_EWCaFlag on EWCa (1)meta.codecharf_EWHe4Flag on EWHe4 (1)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroupStar grouping (G1)meta.codecharSeq[4/329]? Sequence number as in table 3meta.idintnullableNameStar namemeta.id;meta.maincharS/N[0.3/3.4] Signal-to-noise ratio of the obtained spectrumstat.snrfloatEWCa[0.1/4]? CaIIK 3933.7 equivalent width0.1nmspect.line.eqWidthfloatnullablel_EWNIILimit flag on EWNIImeta.code.errorcharEWNII[0.01/0.5]? NII 3995.0 equivalent width0.1nmspect.line.eqWidthfloatnullableEWHe1[0.01/0.7]? HeI 4009.3 equivalent width0.1nmspect.line.eqWidthfloatnullablef_EWHe1Flag on EWHe1 (1)meta.codecharl_EWHe2[<= ] Limit flag on EWHe2meta.code.errorcharEWHe2[0.01/1.5]? HeI 4026.2 equivalent width0.1nmspect.line.eqWidthfloatnullablef_EWHe2Flag on EWHe2 (1)meta.codecharEWHd[4/17.6]? H{delta} 4101.7 equivalent width0.1nmspect.line.eqWidth;em.line.Hdeltafloatnullablel_EWHe3Limit flag on EWHe3meta.code.errorcharEWHe3[0.05/0.5]? HeI 4120.8 equivalent width0.1nmspect.line.eqWidthfloatnullablef_EWHe3Flag on EWHe3 (1)meta.codecharl_EWSiLimit flag on EWSimeta.code.errorcharEWSi[0.02/0.8]? SiII 4128.1, 4130.9 equivalent width0.1nmspect.line.eqWidthfloatnullablef_EWSiFlag on EWSi (1)meta.codecharl_EWHe4[<= ] Limit flag on EWHe4meta.code.errorcharEWHe4[0.01/0.9]? HeI 4143.7 equivalent width0.1nmspect.line.eqWidthfloatnullableEWHg[4/18]? H{gamma} 4340.4 equivalent width0.1nmspect.line.eqWidth;em.line.Hgammafloatnullablef_EWHgFlag on EWHg (1)meta.codecharl_EWHe5Limit flag on EWHe5meta.code.errorcharEWHe5[0.1/1]? HeI 4387.9 equivalent width0.1nmspect.line.eqWidthfloatnullablef_EWHe5Flag on EWHe5 (1)meta.codecharl_EWHe6Limit flag on EWHe6meta.code.errorcharEWHe6[0.02/1.6]? HeI 4471.5 equivalent width0.1nmspect.line.eqWidthfloatnullablef_EWHe6Flag on EWHe6 (1)meta.codecharEWMg[0.1/0.9] MgII 4491.2 equivalent width0.1nmspect.line.eqWidthfloatEWHb[3.6/16]? H{beta} 4862.3 equivalent width0.1nmspect.line.eqWidth;em.line.Hbetafloatnullablef_EWHbFlag on EWHb (1)meta.codecharl_EWHe7[<= ] Limit flag on EWHe7meta.code.errorcharEWHe7[0.1/1]? HeI 4921.9 equivalent width0.1nmspect.line.eqWidthfloatnullablef_EWHe7Flag on EWHe7 (1)meta.codecharEWHa[3.4/11]? H{alpha} 6562.8 equivalent width0.1nmspect.line.eqWidth;em.line.Halphafloatnullablef_EWHaFlag on EWHa (1)meta.codecharl_EWHe8Limit flag on EWHe8meta.code.errorcharEWHe8[0.01/0.7]? HeI 6678.2 equivalent width0.1nmspect.line.eqWidthfloatnullablef_EWHe8Flag on EWHe8 (1)meta.codecharSpTDerived MK spectral typesrc.spTypecharJ/ApJ/771/110/table6Final List of early-type stars showing indications of membership with TaurusMmMembership code (1)meta.code.membercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[19/329] Sequence number (as in table 3)meta.idintNameStar namemeta.id;meta.maincharANameAlternative identifiermeta.idcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainSpTMK spectral typesrc.spTypechardHIP[123/177]? Hipparcos derived distancepcpos.distance;pos.heliocentricintnullableE_dHIP[13/43]? Upper limit uncertainty in dHIPpcstat.error;stat.maxintnullablee_dHIP[11/29]? Lower limit uncertainty in dHIPpcstat.errorintnullablef_dSp[d] Discrepent values for V892 Tau (2)meta.codechardSp[120/422]? Spectroscopic derived distancepcpos.distance;pos.heliocentricintnullablee_dSp[1/52]? dSp uncertainty (3)pcstat.errorintnullablel_Pchi2Limit flag on Pchi2meta.code.errorcharPchi2The probability of proper-motion membership (P({chi}^2^) (see section 2.3.2)stat.fit.goodnessfloatHRV[7.3/20.3]? Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HRV[0.9/4.1]? RV uncertaintykm/sstat.errorfloatnullableCommCommentsmeta.notechar