J/ApJ/817/113ivo://CDS.VizieR/J/ApJ/817/113doi:10.26093/cds/vizier.18170113CDSLamb J.B.Oey M.S.Segura-Cox D.M.Graus A.S.Kiminki D.C.,Golden-Marx J.B.Parker J.W.2017-09-22T16:16:34Z2016-05-11T14:53:17ZCDS support team

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

cds-question@unistra.frearly-type-starsradial-velocitystellar-spectral-typessurveysWe present the Runaways and Isolated O-Type Star Spectroscopic Survey of the SMC (RIOTS4), a spatially complete survey of uniformly selected field OB stars that covers the entire star-forming body of the Small Magellanic Cloud (SMC). Using the IMACS (Inamori-Magellan Areal Camera and Spectrograph) multislit spectrograph and MIKE (Magellan Inamori Kyocera Echelle) echelle spectrograph on the Magellan telescopes, we obtained spectra of 374 early-type field stars that are at least 28pc from any other OB candidates. We also obtained spectra of an additional 23 field stars in the SMC bar identified from slightly different photometric criteria. Here, we present the observational catalog of stars in the RIOTS4 survey, including spectral classifications and radial velocities. For three multi-slit fields covering 8% of our sample, we carried out monitoring observations over 9-16 epochs to study binarity, finding a spectroscopic, massive binary frequency of at least ~60% in this subsample. Classical Oe/Be stars represent a large fraction of RIOTS4 (42%), occurring at much higher frequency than in the Galaxy, consistent with expectation at low metallicity. RIOTS4 confirmed a steep upper initial mass function in the field, apparently caused by the inability of the most massive stars to form in the smallest clusters. Our survey also yields evidence for in situ field OB star formation, and properties of field emission-line star populations, including sgB[e] stars and classical Oe/Be stars. We also discuss the radial velocity distribution and its relation to SMC kinematics and runaway stars. RIOTS4 presents a first quantitative characterization of field OB stars in an external galaxy, including the contributions of sparse, but normal, star formation; runaway stars; and candidate isolated star formation.2016ApJ...817..113Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/817/113CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/236 : UBVR CCD survey of the Magellanic clouds (Massey, 2002)III/195 : Atlas of Optical Spectral Classification OB Stars (Walborn+ 1990)V/13 : Probable Members of the SMC (Azzopardi+ 1975, 1979)III/23 : MK Classification for OB Stars (Lesh 1968)J/A+A/562/A125 : OGLE-III SMC massive stars VI LCs (Kourniotis+, 2014)J/ApJ/771/111 : SMC dusty OB stars. I. Optical spectroscopy (Sheets+, 2013)J/ApJ/763/101 : Massive field OB stars in the SMC (Lamb+, 2013)J/A+A/509/A11 : Ha emission-line objects in SMC clusters (Martayan+, 2010)J/AJ/140/416 : IR photometry of massive stars in the SMC (Bonanos+, 2010)J/AJ/137/3358 : Speckle interferometry of massive stars (Mason+, 2009)J/ApJ/697/1695 : The Chandra survey of the SMC "Bar". II. (Antoniou+, 2009)J/MNRAS/386/826 : Radial velocities of SMC massive stars (Evans+, 2008)J/ApJ/652/458 : BVRH{alpha} photometry of cand. Be stars (Wisniewski+, 2006)J/MNRAS/353/601 : 2dF survey of the Small Magellanic Cloud (Evans+, 2004)J/AJ/127/1632 : UBVR(UIT) photometry of O and OB stars in SMC (Oey+, 2004)J/AJ/123/855 : Magellanic Clouds Photometric Survey: SMC (Zaritsky+, 2002)J/AJ/116/180 : Magellanic clouds ultraviolet observations (Parker+ 1998)J/AcA/48/147 : OGLE SMC BVI photometry (Udalski+ 1998)J/MNRAS/121/337 : Radcliffe Catalog of stars in Magellanic Clouds (Feast+ 1960)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/817/113https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/817/113http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/817/113https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/817/113https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/817/113http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/817/113GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/817/113/table2 (Additional UV-optically selected stars in the SMC bar)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/817/113/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/817/113/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/817/113/table2?GETtext/xml+votable180.050000true11.3259167-73.25638890.005555555555555556Cone search capability for table J/ApJ/817/113/table1 (Runaways and Isolated O-Type Star Spectroscopic Survey of the SMC (RIOTS4) catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/817/113/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/817/113/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/817/113/table1?GETtext/xml+votable180.050000true10.117125-73.54247220.0055555555555555565/8323 8326 6/33297 33298 33299 33316 33317 33319 333283.322582951404819e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/817/113?format=asciiOpticaldefaultJ/ApJ/817/113/table2Additional UV-optically selected stars in the SMC barrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[M2002][107/84544] Massey 2002 (Cat. II/236) identifier (<[M2002] SMC NNNNN> in Simbad)meta.id;meta.mainintBmag[12.4/15.3] Massey 2002 (Cat. II/236) B band magnitudemagphot.mag;em.opt.BfloatVmag[11.5/15.5] Massey 2002 (Cat. II/236) V band magnitudemagphot.mag;em.opt.VfloatQ[-1.8/-0.8] The reddening-free Q_UBR_ parameter (Q_UBR_=(U-R)-1.396*(B-R))phot.color.reddFreefloatAv[0/2.1] The V band extinction (1)magphys.absorption;em.opt.VfloatSpTMK spectral typesrc.spTypef_SpT[f] Flag on SpT (2)meta.codecharRVel[44/395]? Radial velocitykm/sphys.veloc;pos.heliocentricintnullableRVelHI[97/215]? The H I radial velocity (3)km/sphys.veloc;pos.heliocentricintnullableInstInstrument used in the observation (IMACS f/4; and IMACS f/2 or MIKE for table 1)instr.setup;obscharDate? UT date of the observationtime.epoch;obsnullableFlag[e] Multiple observation flag (2)meta.code.errorcharZ02Display data from Zaritsky+, 2002, J/AJ/123/855, within 1"meta.ref.urlintnullableO04Display data from Oey+, 2004, J/AJ/127/1632, within 1"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Massey, 2002, Cat. II/236 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Massey, 2002, Cat. II/236 (declination part)degpos.eq.dec;meta.mainJ/ApJ/817/113/table1Runaways and Isolated O-Type Star Spectroscopic Survey of the SMC (RIOTS4) catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[M2002][107/84544] Massey 2002 (Cat. II/236) identifier (<[M2002] SMC NNNNN> in Simbad)meta.id;meta.mainintBmag[12.4/15.3] Massey 2002 (Cat. II/236) B band magnitudemagphot.mag;em.opt.BfloatVmag[11.5/15.5] Massey 2002 (Cat. II/236) V band magnitudemagphot.mag;em.opt.VfloatQ[-1.8/-0.8] The reddening-free Q_UBR_ parameter (Q_UBR_=(U-R)-1.396*(B-R))phot.color.reddFreefloatAv[0/2.1] The V band extinction (1)magphys.absorption;em.opt.VfloatSpTMK spectral typesrc.spTypef_SpT[f] Flag on SpT (2)meta.codecharRVel[44/395]? Radial velocitykm/sphys.veloc;pos.heliocentricintnullableRVelHI[97/215]? The H I radial velocity (3)km/sphys.veloc;pos.heliocentricintnullableInstInstrument used in the observation (IMACS f/4; and IMACS f/2 or MIKE for table 1)instr.setup;obscharDate? UT date of the observationtime.epoch;obsnullableFlag[e] Multiple observation flag (2)meta.code.errorcharZ02Display data from Zaritsky+, 2002, J/AJ/123/855, within 1"meta.ref.urlintnullableO04Display data from Oey+, 2004, J/AJ/127/1632, within 1"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Massey, 2002, Cat. II/236 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Massey, 2002, Cat. II/236 (declination part)degpos.eq.dec;meta.main