J/AJ/155/207ivo://CDS.VizieR/J/AJ/155/207doi:10.26093/cds/vizier.51550207CDSNeugent K.F.Massey P.Morrell N.I.Skiff B.Georgy C.2019-01-28T11:56:39Z2018-12-19T13:04:10ZCDS support team

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

cds-question@unistra.frmagellanic-cloudssupergiant-starsinfrared-photometryvisible-astronomybroad-band-photometryradial-velocitystellar-spectral-typesspectroscopyWe recently discovered a yellow supergiant (YSG) in the Small Magellanic Cloud (SMC) with a heliocentric radial velocity of ~300 km/s, which is much larger than expected for a star at its location in the SMC. This is the first runaway YSG ever discovered and only the second evolved runaway star discovered in a galaxy other than the Milky Way. We classify the star as G5-8 I and use de-reddened broad-band colors with model atmospheres to determine an effective temperature of 4700+/-250 K, consistent with what is expected from its spectral type. The star's luminosity is then log L/L_{sun}_~4.2~0.1, consistent with it being a ~30 Myr 9 M_{sun}_ star according to the Geneva evolution models. The star is currently located in the outer portion of the SMC's body, but if the star's transverse peculiar velocity is similar to its peculiar radial velocity, in 10 Myr the star would have moved 1.6{deg} across the disk of the SMC and could easily have been born in one of the SMC's star-forming regions. Based on its large radial velocity, we suggest it originated in a binary system where the primary exploded as a supernovae, thus flinging the runaway star out into space. Such stars may provide an important mechanism for the dispersal of heavier elements in galaxies given the large percentage of massive stars that are runaways. In the future, we hope to look into additional evolved runaway stars that were discovered as part of our other past surveys.2018AJ....155..207Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/155/207CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/31 : Michigan catalogue for the HD stars, vol. 1 (Houk+, 1975)V/13 : Probable Members of the SMC (Azzopardi+ 1975, 1979)II/236 : UBVR CCD survey of the Magellanic clouds (Massey+, 2002)J/A+AS/30/261 : UBV and Radial Velocities of SMC SupergiantsJ/AJ/123/855 : Magellanic Clouds Photometric Survey: the SMCJ/AJ/126/2867 : Red supergiants in Magellanic Clouds (Massey+, 2003)J/MNRAS/353/601 : 2dF survey of the Small Magellanic Cloud (Evans+, 2004)J/ApJ/719/1784 : Yellow supergiants in the SMC (Neugent+, 2010)J/ApJ/754/35 : Red supergiant stars in the SMC. II. (Yang+, 2012)J/A+A/578/A3 : New survey of supergiants in the MCshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/155/207https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/155/207http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/155/207https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/155/207https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/155/207http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/155/207GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/155/207/table3 (Properties of observed targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/155/207/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/155/207/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/155/207/table3?GETtext/xml+votable180.050000true8.6070417-73.37597220.005555555555555556Cone search capability for table J/AJ/155/207/fig2 (Spectral classification stars and runaway star spectrum)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/155/207/fig2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/155/207/fig2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/155/207/fig2?GETtext/xml+votable180.050000true13.2580542-71.64375750.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/AJ/155/2075/8323 8329 6/33079 33094 33101 33115 33287 33297 33298 33299 33304 33305 33306 33325 33328 333308.650015785639275e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/155/207?format=asciiInfraredOpticaldefaultJ/AJ/155/207/table3Properties of observed targetsJ-Ks[0/0.92] The (J-K_S_) colormagphot.color;em.IR.J;em.IR.KfloatDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identification (JHHMMSSss+DDMMSSs)meta.id;meta.maincharf_2MASS[a] Flag on 2MASS (1)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainKsmag[5.51/12.89] 2MASS K_S_ band magnitudemagphot.mag;em.IR.KfloatVmag[8.42/14.11]? V band magnitudemagphot.mag;em.opt.VfloatnullableB-V[-0.07/1.78]? The (B-V) colormagphot.color;em.opt.B;em.opt.VfloatnullablePRef[1/5] The Vmag and B-V photometry reference (2)meta.bibintHRV[-97.46/296.1] Heliocentric radial velocity (3)km/sspect.dopplerVeloc;pos.heliocentricfloatr[13.1/158.7] r parameter from Tondry & Davis (1979AJ.....84.1511T)stat.fit.paramfloatCat[1/3] Category (4)src.classintSpTypeHSpectral classification from Hydra spectrasrc.spTypecharSpTypeLLiterature spectral classification (3)src.spTypecharr_SpTypeL[1/28]? Spectral classification reference (5)meta.ref;pos.frameintnullableComAdditional comments (6)meta.notechar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/155/207/fig2Spectral classification stars and runaway star spectrumSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar name (1)meta.id;meta.maincharSpTypeSpectral type (from Table 2 of this paper)src.spTypecharspspectrummeta.ref.urlcharFileNameName of FITS file, in subdirectory spmeta.id;meta.fitscharAssocDataAssociated Data web pagemeta.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