J/ApJ/889/50ivo://CDS.VizieR/J/ApJ/889/50doi:10.26093/cds/vizier.18890050CDSYep A.C.White R.J.2022-09-21T09:19:05Z2021-11-10T13:20:56ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsradial-velocitystellar-spectral-typesstellar-agesline-intensitiesWe have conducted a high-dispersion (R~34000) optical spectroscopic study of 10 young stars near the cometary globule CG 30 in the Gum Nebula, a diffuse HII region home to at least 32 cometary globules. All 10 spectroscopically observed stars at the nebula's northern edge are of low mass (spectral types M4.5-K5), have broad H{alpha} emission, and show spectral veiling. Eight of the 10 are classical T Tauri stars. We spectroscopically measure the photospheric properties of CG 30 IRS 4 inside CG 30. Though embedded, CG 30 IRS 4 is T Tauri-like, with relatively slow projected rotation and moderate veiling. Undepleted Li absorptions, strong H{alpha} emissions, and positions well above the main sequence on an H-R diagram suggest that the 10 stars are <~1Myr old. Using our measurements, previous spectroscopy, and previous photometry of 11 other young stars in the area, we determine stellar, kinematic, and accretion properties of a total of 21 young stars. Shared radial velocities, proper motions, distances, and ages suggest that 14 of the young stars (including CG 30 IRS 4) are kinematically related to CG 30. From Gaia DR2 distances to six of these stars, we derive a distance of 358.1+/-2.2pc to the cometary globule complex CG 30/31/38. The CG 30 association has an accretor fraction of 29%+/-14%, low for quiescent clusters of similar age but consistent with other irradiated clusters. The Gum Nebula's moderate radiation environment (G_0_=6.6_-2.7_^+3.2^ at CG 30) may be strong enough to shorten disk lifetimes.2020ApJ...889...50Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/889/50CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/pastel : The PASTEL catalogue (Soubiran+, 2016-)II/224 : Catalogue of Stellar Diameters (CADARS) (Pasinetti-Fracassini+ 2001)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)I/345 : Gaia DR2 (Gaia Collaboration, 2018)VII/216 : H-{alpha} emission regions in Southern Milky Way (Rodgers+ 1960)J/A+A/297/391 : T Tauri stars ROSAT survey (Neuhaeuser+, 1995)J/A+AS/115/81 : A CS(2-1) survey of UC HII regions (Bronfman+, 1996)J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)J/A+A/331/581 : Rotation and activity in field M dwarfs (Delfosse+ 1998)J/ApJS/141/503 : Radial Velocities for 889 late-type stars (Nidever+, 2002)J/A+A/428/149 : Hipparcos parallaxes of O stars (Schroeder+, 2004)J/AJ/130/188 : Young stars in Trumpler 37 & NGC 7160 (Sicilia-Aguilar+, 2005)J/AJ/129/363 : Spectroscopy in Orion Nebula Cluster (Sicilia-Aguilar+, 2005)J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)J/ApJ/662/1067 : Sptizer observations of sigma Orionis (Hernandez+, 2007)J/ApJS/207/5 : YSOs in LDN 1641 with Hectochelle spectra (Fang+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/A+A/559/A3 : Low-mass stars in Trumpler 37 (Sicilia-Aguilar+, 2013)J/A+A/563/A94 : Kinematics of the Gamma Vel cluster (Jeffries+, 2014)J/A+A/619/A155 : Open cluster kinematics with Gaia DR2 (Soubiran+, 2018)J/AJ/157/85 : The CIDA Variability Survey of Orion OB1. II. (Briceno+, 2019)J/A+A/621/A115 : Vela OB2 members (Cantat-Gaudin+, 2019)J/A+A/626/A11 : Corona Australis ALMA and X-Shooter data (Cazzoletti+, 2019)J/ApJ/870/32 : Kinematics in young star clusters & associations (Kuhn+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/889/50https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/889/50http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/889/50https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/889/50https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/889/50http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/889/50GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/889/50/spsample (Basic properties (Table 1) and radial and rotational velocities (Table 3) and Veiling and spectral types (Table 5))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/50/spsample?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/50/spsample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/50/spsample?GETtext/xml+votable180.050000true122.0922917-36.0630750.005555555555555556Cone search capability for table J/ApJ/889/50/table67 (HR diagram parameters (Table 6) and proper motions and radial velocities (Table 7))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/50/table67?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/50/table67?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/50/table67?GETtext/xml+votable180.050000true122.1411028-36.13599920.005555555555555556Cone search capability for table J/ApJ/889/50/table8 (Accretor fractions of star-forming regions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/50/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/50/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/50/table8?GETtext/xml+votable180.050000true247.025-24.54170.005555555555555556Cone search capability for table J/ApJ/889/50/table9 (Hot star parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/50/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/50/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/50/table9?GETtext/xml+votable180.050000true120.8960314-40.00314780.0055555555555555566/1072 1539 15478 15662 21430 21438 22805 22829 22854 36956 38382 39216 39235 39327 39375 39386 39396 39398 42619 42981 443538.650015785639275e-20 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/889/50?format=asciidefaultJ/ApJ/889/50/spsampleBasic properties (Table 1) and radial and rotational velocities (Table 3) and Veiling and spectral types (Table 5)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintvsini[6.3/28] Rotational velocity times the sin(inclination)km/sphys.veloc.rotatfloatNeqwNumber of equivalent width measurements for this star (link to Table 2)meta.ref.urlintnullableNameStar Namemeta.id;meta.maincharm_NameComponent for PHa 41 (1)meta.code.multipcharRAJ2000[8] 2MASS Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[35/36] 2MASS Degree of Declination (J2000)pos.eq.dec;meta.mainSpTlSpectral type from Pettersson (1987A&A...171..101P)src.spTypecharVmag[14.3/16.55]? V band magnitude (2)magphot.mag;em.opt.Vfloatnullablee_Vmag[0.029/1.1]? Uncertainty in Vmag (2)magstat.error;phot.magfloatnullableKsmag[8.9/12.1] 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloate_Ksmag[0.019/0.05] Uncertainty in Ksmagmagstat.error;phot.magfloatHRV[21.9/33.7] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.15/2] Uncertainty in HRVkm/sstat.errorfloate_vsini[0.2/2.7] Uncertainty in vsinikm/sstat.error;phys.veloc.rotatfloatSpTBest spectral typesrc.spTypechare_SpT[0.5/1] Spectral type uncertainty, subclassesstat.errorfloatr6500[0.16/7.5] Veiling, 6500{AA}phys.absorptionfloate_r6500[0.1/0.63] Uncertainty in r6500stat.errorfloatr8400[0/7.54] Veiling, 8400{AA}phys.absorptionfloate_r8400[0.1/1.7] Uncertainty in r8400stat.errorfloatJ/ApJ/889/50/table2Equivalent widthsEWLi[0.05/0.7] Equivalent Width, LiI, this work0.1nmspect.line.eqWidthfloate_EWLi[0.01/0.82] Uncertainty in EWLi0.1nmstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar Name (1)meta.id;meta.maincharm_NameComponent for PHa 41meta.code.multipcharObs[2003/2004] Observation date, yeartime.epoch;obsEWHaP87[-130.5/-16.1]? Equivalent Width, LiI, published in Pettersson (1987A&A...171..101P)0.1nmmeta.ref;spect.line.eqWidthfloatnullableEWHaK05[-26.6/-8.4]? Equivalent Width, LiI, published in Kim+ 2005AJ....129.1564K0.1nmmeta.ref;spect.line.eqWidthfloatnullableEWHa[-83.0/-0.5] Equivalent Width, H{alpha}, this work0.1nmspect.line.eqWidthfloate_EWHa[0.3/10] Uncertainty in EWHa0.1nmstat.errorfloatl_W10HaLimit flag on W10Hameta.code.errorcharW10Ha[-13.6/-4.9] H{alpha} emission profile, 10% peak height above continuum0.1nmspect.line.widthfloatl_W10HavLimit flag on W10Havmeta.code.errorcharW10Hav[225/621] H{alpha} emission profilekm/sspect.line.widthfloatEWLiK05[0.5/0.54]? Equivalent Width, LiI, published in Kim+ 2005AJ....129.1564K0.1nmmeta.ref;spect.line.eqWidthfloatnullablee_EWLiK05[0.04/0.06]? Uncertainty in EWLiK050.1nmstat.errorfloatnullableJ/ApJ/889/50/table4PHa 41 A and B velocities across 3 epochsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[52687.47/53099.35] Modified Julian Date of observation (JD-2400000.5)dtime.epochdoubleHRVA[4.27/63.73] Heliocentric radial velocity, Component Akm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVA[0.19/0.5] Uncertainty in HRVAkm/sstat.errorfloatHRVB[-0.7/51.7] Heliocentric radial velocity, Component Bkm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVB[1.3/1.5] Uncertainty in HRVBkm/sstat.errorfloatvsiniA[11.8/16.4] Rotational velocity times the sin(inclination), Component Akm/sphys.veloc.rotatfloate_vsiniA[1.1/1.4] Uncertainty in vsiniAkm/sstat.errorfloatvsiniB[9.0/17.2] Rotational velocity times the sin(inclination), Component Bkm/sphys.veloc.rotatfloate_vsiniB[1.4/3.1] Uncertainty in vsiniBkm/sstat.errorfloatJ/ApJ/889/50/table67HR diagram parameters (Table 6) and proper motions and radial velocities (Table 7)SimbadNameSimbad column added by the CDSmeta.idcharnullablee_Av[0.5/5]? Uncertainty in Avmagstat.errorfloatnullabledelK[-0.2/1.3] Delta K band, infrared excessmagphot.mag;em.IR.KfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroup[1/5] Group (1)meta.codeintFlag[np] Derived properties flag (2)meta.code.errorcharSpDisplay the spectroscopic results for this starmeta.ref.urlintnullableNameStar Namemeta.id;meta.maincharprimarym_NameComponent for PHa 41meta.code.multipcharAv[0/2.3] Line of sight extinction, V bandmagphys.absorption;spect.linefloate_delK[0.1/0.14]? Uncertainty in Avmagstat.errorfloatnullablembol[10.9/16.3] bolometric magnitudemagphot.mag.bolfloate_mbol[0.23/2.1]? Uncertainty in Avmagstat.errorfloatnullableDist[155/7000] Distancepcpos.distance;pos.heliocentricfloatE_Dist[2.2/2800] Upper uncertainty on Distpcstat.error;stat.maxfloate_Dist[2.2/2000] Lower uncertainty on Distpcstat.errorfloatTeff[3100/6510] Effective surface temperatureKphys.temperature.effectivefloatE_Teff[20/690] Upper uncertainty on TeffKstat.error;stat.maxfloate_Teff[50/590] Lower uncertainty on TeffKstat.error;phys.temperature.effectivefloatLstar[0.02/76] Stellar luminosity, solar unitssolLumphys.luminosityfloatE_Lstar[0.02/64]? Upper uncertainty on LstarsolLumstat.error;stat.maxfloatnullablee_Lstar[0.02/48]? Lower uncertainty on LstarsolLumstat.errorfloatnullableDistIso[191/9536] Isochronal distancepcpos.distanceintHRV[-74.1/49.2]? Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HRV[0.15/3]? Uncertainty in HRVkm/sstat.errorfloatnullablepmRA[-22.95/-1.95]? Proper motion in Right Ascensionmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA[0.05/4.8]? Uncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE[0.5/21.21]? Proper motion in Declinationmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE[0.05/4.7]? Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullable2MDisplay the 2MASS data (II/246) within 3"meta.ref.urlchar_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/ApJ/889/50/table8Accretor fractions of star-forming regionsSimbadNameSimbad column added by the CDSmeta.idcharnullabler_AgeReferences for Age (1)meta.ref;pos.framecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroup[1/2] Group: 1=Quiescent or 2=Irradiatedmeta.codeintRegionRegionmeta.notel_Age[~< ] Limit flags on Agemeta.code.error;time.agecharb_Age[0.1/5]? Age range, minimumMyrtime.age;stat.minfloatnullableB_Age[1/10]? Age range, maximumMyrtime.age;stat.maxintnullableNacc[1/159]? Number, accreting membersmeta.numberintnullableNtot[14/450]? Number, total membersmeta.number;phys.atmol.numberintnullabler_NtotReferences for Nacc/Ntot (1)meta.ref;pos.framecharu_frac[~] Uncertainty flag on fracmeta.code.errorcharfrac[2/59] Accretor fraction%meta.numberfloate_frac[2/16]? Uncertainty for frac%stat.errorfloatnullabler_frac[ce] References for frac (1)meta.ref;pos.framechar_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/ApJ/889/50/table9Hot star parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar Namemeta.id;meta.mainTeff[35000/57000]? Stellar effective temperatureKphys.temperature.effectiveintnullabler_Teff[ai] Reference for Teff (1)meta.ref;pos.framecharUmag[0.64/0.89]? U band magnitudemagphot.mag;em.opt.Ufloatnullabler_Umag[ci] Reference for Umag (1)meta.ref;pos.framecharBmag[1.58/1.98]? B band magnitudemagphot.mag;em.opt.Bfloatnullabler_Bmag[ci] Reference for Bmag (1)meta.ref;pos.framecharVmag[1.83/2.25]? V band magnitudemagphot.mag;em.opt.Vfloatnullabler_Vmag[ci] Reference for Vmag (1)meta.ref;pos.framecharAvmag[0.13/0.51]? Extinctionmagphys.absorptionfloatnullabler_Avmag[d] Reference for Avmag (1)meta.refcharDist[294/349] Distancepcpos.distance;pos.heliocentricintE_Dist[12/76] Upper uncertainty on Distpcstat.error;stat.maxinte_Dist[11/50] Lower uncertainty on Distpcstat.errorintr_Dist[be] Reference for Dist (1)meta.ref;pos.framecharRstar[3.2/18.7]? Stellar radius, solar unitssolRadmeta.unit;phys.size.radiusfloatnullableE_Rstar[2.3]? Upper uncertainty on RstarsolRadstat.error;stat.maxfloatnullablee_Rstar[1.9]? Lower uncertainty on RstarsolRadstat.errorfloatnullabler_Rstar[af] Reference for Rstar (1)meta.ref;pos.framecharHRV[-23.9/15]? Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HRV[2.9/3.1]? Uncertainty in HRVkm/sstat.errorfloatnullabler_HRV[g] Reference for HRV (1)meta.ref;pos.framecharpmRA[-29.71/-6]? Proper motion in Right Ascensionmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA[0.08/0.3]? Uncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullabler_pmRA[h] Reference for pmRA (1)meta.ref;pos.pm;pos.eq.racharpmDE[10.43/16.68]? Proper motion in Declinationmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE[0.09/0.32]? Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullabler_pmDE[h] Reference for pmDE (1)meta.ref;pos.pm;pos.eq.deccharG0[0.5/3.7] Radiation environmentstat.fit.paramfloatE_G0[0.1/2.7] Upper uncertainty in G0stat.error;stat.maxfloate_G0[0.3/1.6] Lower uncertainty in G0stat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_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.main