J/ApJ/898/85ivo://CDS.VizieR/J/ApJ/898/85doi:10.26093/cds/vizier.18980085CDSMargon B.Massey P.Neugent K.F.Morrell N.2024-12-30T20:08:46Z2021-12-15T08:58:28ZCDS support team

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

cds-question@unistra.frmagellanic-cloudswolf-rayet-starsinfrared-astronomyspectroscopyvisible-astronomyWe present a narrowband imaging survey of the Large Magellanic Cloud (LMC), designed to isolate the CII{lambda}{lambda}7231,7236 emission lines in objects as faint as m_{lambda}7400_~18. The work is motivated by the recent serendipitous discovery in the LMC of the first confirmed extragalactic [WC11] star, whose spectrum is dominated by CII emission, and the realization that the number of such objects is currently largely unconstrained. The survey, which imaged ~50deg^2^ using on-band and off-band filters, will significantly increase the total census of these rare stars. In addition, each new LMC [WC] star has a known luminosity, a quantity quite uncertain in the Galactic sample. Multiple known CII emitters were easily recovered, validating the survey design. We find 38 new CII emission candidates; spectroscopy of the complete sample will be needed to ascertain their nature. In a preliminary spectroscopic reconnaissance, we observed three candidates, finding CII emission in each. One is a new [WC11]. Another shows both the narrow CII emission lines characteristic of a [WC11], but also broad emission of CIV, OV, and HeII characteristic of a much hotter [WC4] star; we speculate that this is a binary [WC]. The third object shows weak CII emission, but the spectrum is dominated by a dense thicket of strong absorption lines, including numerous OII transitions. We conclude it is likely an unusual hot, hydrogen-poor post-AGB star, possibly in transition from [WC] to white dwarf. Even lacking a complete spectroscopic program, we can infer that late [WC] stars do not dominate the central stars of LMC planetary nebulae, and that the detected CII emitters are largely of an old population.2020ApJ...898...85Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/898/85CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/232 : Nebulae in the Magellanic Clouds (Davies+ 1976)III/85 : Sixth Catalogue of Galactic Wolf-Rayet Stars (van der Hucht+ 1981)III/211 : Keck/HIRES Sky Line Atlas (Osterbrock+ 1997)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/311 : WISE All-Sky Data Release (Cutri+ 2012)I/345 : Gaia DR2 (Gaia Collaboration, 2018)II/370 : XMM-OM Serendipitous Source Survey Cat. (XMM-SUSS5.0) (Page+, 2021)J/MNRAS/234/583 : Abundances in Magellanic Cloud PNe (Monk+ 1988)J/A+A/403/659 : Classification of WR planetary nebulae (Acker+, 2003)J/AJ/128/1606 : Magellanic Clouds Photometric Survey: the LMC (Zaritsky+, 2004)J/A+A/456/451 : Magellanic Clouds PNe abundances (Leisy+, 2006)J/MNRAS/373/521 : Complete catalog of planetary nebulae in LMC (Reid+, 2006)J/AJ/138/1003 : IR photometry of massive LMC stars (Bonanos+, 2009)J/MNRAS/405/1349 : LMC PNe [OIII] 5007{AA} and H{beta} flux (Reid+, 2010)J/A+A/530/A90 : Optically bright post-AGB population of LMC (van Aarle+, 2011)J/ApJ/748/96 : Massive binaries in the LMC (Massey+, 2012)J/ApJ/749/177 : Yellow and red supergiants in the LMC (Neugent+, 2012)J/ApJS/221/12 : AGNs in the MIR using AllWISE data (Secrest+, 2015)J/A+A/616/A12 : Gaia DR2 sources in GC and dSph (Gaia Collaboration+, 2018)J/ApJ/863/181 : The fifth catalog of LMC Wolf-Rayet stars (Neugent+, 2018)J/ApJS/236/37 : The Gaia-WISE extragalactic astrometric catalog (Paine+, 2018)J/AJ/158/192 : HeII emission from WR stars in MW & LMC (Leitherer+, 2019)J/ApJ/888/54 : Spectra of a rare low-mass WR star in LMC (Margon+, 2020)J/ApJS/252/21 : Multiwavelength survey of WR stars in LMC (Hung+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/898/85https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/898/85http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/898/85https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/898/85https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/898/85http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/898/85GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/898/85/table1 (Spectroscopically verified LMC CII emission stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/898/85/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/898/85/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/898/85/table1?GETtext/xml+votable180.050000true82.8407083-70.29444440.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/ApJ/898/856/33096 33121 375043.830199579824256e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/898/85?format=asciiOpticalInfrareddefaultJ/ApJ/898/85/table1Spectroscopically verified LMC CII emission starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier of the sourcemeta.idcharRAJ2000Gaia DR2 hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Gaia DR2 degree of declination (J2000)pos.eq.dec;meta.mainpmRA[1.78/1.95] Gaia DR2 proper motion in RAmas/yrpos.pm;pos.eq.rafloate_pmRA[0.06/0.16] PmRA uncertaintymas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-0.22/1.03] Gaia DR2 proper motion in DECmas/yrpos.pm;pos.eq.decfloate_pmDE[0.07/0.17] PmDE uncertaintymas/yrstat.error;pos.pm;pos.eq.decfloatplx[-0.15/0.09] Gaia DR2 parallaxmaspos.parallax.trigfloate_plx[0.03/0.08] Parallax uncertaintymasstat.error;pos.parallaxfloatmag[16/17.3] {lambda}7410 magnitudemagphot.mag;em.opt.Rfloatdelmag[-1.68/-0.25] Magnitude difference ({Delta}m), on-band minus off-band filtermagphot.mag;arith.difffloatSig[10/62] Significance level of detection ({Delta}m divided by photometric error)stat.fit.goodness;instr.saturationint2MASS2MASS name (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharVmag[15.37/16.27] Johnson V magnitude (1)magphot.mag;em.opt.Vfloat(B-V)[-0.16/0.87] (B-V) color index (1)magphot.color;em.opt.B;em.opt.Vfloat(U-B)[-1.09/-0.3] (U-B) color index (1)magphot.color;em.opt.U;em.opt.BfloatJmag[15.48/16.19] 2MASS J-band magnitudemagphot.mag;em.IR.Jfloat(J-H)[-0.15/1.41] (J-H) color indexmagphot.color;em.IR.J;em.IR.Hfloat(H-Ks)[-0.35/1] (H-Ks) color indexmagphot.color;em.IR.H;em.IR.KfloatW2mag[11.12/14.17] WISE W2 (4.6um) band magnitudemagphot.mag;em.IR.4-8umfloat(W1-W2)[-0.2/2.03] (W1-W2) color indexmagphot.color;em.IR;em.IRfloat(W2-W3)[0.63/6.8] (W2-W3) color indexmagphot.color;em.IR;em.IRfloat(W3-W4)[2.56/3.7] (W3-W4) color indexmagphot.color;em.IR;em.IRfloatFileName of the FITS file in subdirectory fits; column added by CDSmeta.id;meta.fitscharfitsDownload the FITS filemeta.ref.urlcharDateUT date of the observation; column added by CDStime.epoch;obsnullableInstInstrument; column added by CDS (2)meta.id;instrcharExp? Exposure time; column added by CDSstime.duration;obs.exposureintnullableZ04Display data from Zaritsky+ 2004, J/AJ/128/1606meta.ref.urlcharWISEDisplay data from WISE (II/311)meta.ref.urlcharGaiaDisplay data from Gaia DR2 (I/345)meta.ref.urlcharSpInteractive spectrum plotmeta.ref.urlcharADatDisplay the VizieR/Saada associated databasemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar