J/AJ/153/174ivo://CDS.VizieR/J/AJ/153/174doi:10.26093/cds/vizier.51530174CDSChojnowski S.D.Wisniewski J.P.Whelan D.G.Labadie-Bartz J.,Borges Fernandes M.Lin C.-C.Majewski S.R.Stringfellow G.S.,Mennickent R.E.Roman-Lopes A.Tang B.Hearty F.R.Holtzman J.A.,Pepper J.Zasowski G.2018-12-19T06:10:25Z2017-08-04T16:35:47ZCDS support team

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

cds-question@unistra.frbe-starsemission-line-starsline-intensitiesradial-velocityWe report on the H-band spectral variability of classical Be stars observed over the course of the Apache Point Galactic Evolution Experiment (APOGEE), one of four subsurveys comprising SDSS-III. As described in the first paper of this series, the APOGEE B-type emission-line (ABE) star sample was culled from the large number of blue stars observed as telluric standards during APOGEE observations. In this paper, we explore the multi-epoch ABE sample, consisting of 1100 spectra for 213 stars. These "snapshots" of the circumstellar disk activity have revealed a wealth of temporal variability including, but not limited to, gradual disappearance of the line emission and vice versa over both short and long timescales. Other forms of variability include variation in emission strength, emission peak intensity ratios, and emission peak separations. We also analyze radial velocities (RVs) of the emission lines for a subsample of 162 stars with sufficiently strong features, and we discuss on a case-by-case basis whether the RV variability exhibited by some stars is caused by binary motion versus dynamical processes in the circumstellar disks. Ten systems are identified as convincing candidates for binary Be stars with as of yet undetected companions.2017AJ....153..174Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/153/174CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/137 : Extended Hipparcos Compilation (XHIP) (Anderson+, 2012)J/AJ/149/7 : SDSS-III/APOGEE. I. Be stars (Chojnowski+, 2015)J/ApJ/786/120 : Spectropolarimetry of classical Be stars (Draper+, 2014)J/ApJ/709/1306 : Spectropolarimetry of 60 Cyg and {pi} Aqr (Wisniewski+, 2010)J/A+A/451/1053 : Fundamental parameters of Be stars (Fremat+, 2006)J/MNRAS/371/252 : Southern B and Be stars (Levenhagen+, 2006)J/A+A/415/145 : Radial velocities of 16 stars in NGC 6913 (Boeche+, 2004)J/A+A/368/912 : Polarization and rotational vel. of Be stars (Yudin, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/153/174https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/153/174http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/153/174https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/153/174https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/153/174http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/153/174GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/153/174/table1 (*Additional new Be stars from APOGEE1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/153/174/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/153/174/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/153/174/table1?GETtext/xml+votable180.050000true271.9704167-17.14733330.005555555555555556Cone search capability for table J/AJ/153/174/table2 (*APOGEE B-type emission-line (ABE) visit summary)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/153/174/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/153/174/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/153/174/table2?GETtext/xml+votable180.050000true305.353550637.38005780.0055555555555555566/1302 1305 1310 1321 1329 1331 1332 1347 1418 1433 1448 1477 1514 1718 1725 1816 1818 1830 1938 1958 1960 1976 2940 2955 3004 3024 3045 3058 3139 3235 3250 3326 3587 3590 3616 3737 3739 3751 3822 3840 6724 6822 9686 12936 12981 12982 12988 13024 13111 13981 14003 14004 14007 14047 14067 14068 14078 14190 14193 14197 14217 14220 14230 14264 14274 14428 14430 14587 14640 14641 14644 14645 14715 14765 15384 15385 15407 15416 15417 15475 15493 15649 15668 15687 15703 15800 20551 20560 20801 20861 21439 21534 21558 21673 21677 21698 22029 22040 22044 22046 22076 22079 22087 22131 22210 22230 22255 22517 23629 23632 23634 23755 23778 23794 23905 23941 23946 23949 23970 23976 23980 23998 24113 24116 24117 24145 24180 24182 24266 24293 24325 24326 24357 24359 24368 24372 24375 24376 24384 24442 24446 24466 24467 24473 24483 24490 24505 24512 28775 28778 28779 28794 28822 28823 28863 28870 28874 28912 28916 28921 28922 29066 29095 29162 29183 29202 29285 29445 29457 29507 29511 29512 29524 29525 29530 29533 29535 29879 29885 30216 30222 30223 30227 30236 30245 30258 30327 30417 30617 30622 30713 32024https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/153/174?format=asciidefaultJ/AJ/153/174/table1*Additional new Be stars from APOGEE1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintABEIdentifier of the APOGEE B-type emission-line (ABE) starmeta.id;meta.maincharHmagH-band magnitudemagphot.mag;em.IR.HfloatNsNumber of spectrameta.numberintMorphMorphology (1)src.morphcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainSimbadNameSimbad column added by the CDSmeta.idcharJ/AJ/153/174/table2*APOGEE B-type emission-line (ABE) visit summaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintABEIdentifier of the Apache Point Observatory Galactic Evolution Experiment (APOGEE) B-type emission-line (ABE) star (running number) (G1)meta.idcharNameStar namemeta.id;meta.maincharPapIDisplay the data from Paper I (Chojnowski et al. 2015, Cat. J/AJ/149/7)meta.numberintnullableNewIndicates an additional new Be star from APOGEE1 (table1)meta.ref.urlcharNobs[2/30] Number of APOGEE observationsmeta.numberintMJD0[55702/56812] Modified Julian Date (MJD) of first APOGEE observation (JD-2400000.5)dtime.epochintdJD[1/1862] Observational baseline ({Delta}JD)dtime.epochint<S/N>[46/800] Mean Signal-to-Noise ratiostat.snr;stat.meanintVTypeVariability classification (1)meta.code.class;src.varchar<PSep>[0/629]? Mean Br11 peak separation (G2)km/sphys.veloc;arith.diff;stat.meanintnullablePAmp[0/128]? Scatter (maximum minus minimum) in Br11 peak separationkm/ssrc.var.amplitudeintnullable<EW>[-17/6] Mean Br11 equivalent width W_Br11_ (in {AA}) (G3)0.1nmspect.line.eqWidth;stat.meanfloate_<EW>[0/2.93] Standard deviation ({sigma}) in <EW> (in {AA})0.1nmstat.error;spect.line.eqWidthfloatEWAmp[0.01/8.37] Scatter (maximum minus minimum) in Br11 equivalent width (in {AA})0.1nmsrc.var.amplitudefloat<RV>[-93/76.6]? Mean radial velocity (G4)km/sspect.dopplerVeloc;stat.meanfloatnullableo_<RV>[3/9]? Mean number of H-Br lines used for radial velocity determination (G5)meta.numberfloatnullablee_<RV>[0.2/14.4]? Mean standard deviation ({sigma}) of line-by-line radial velocitieskm/sstat.errorfloatnullableRVAmp[0/112.9]? Scatter (maximum minus minimum) in radial velocitykm/ssrc.var.amplitudefloatnullableRVTypeType of radial velocity measurement, as described in Section 3.4 (double, shell, or single) (G6)meta.notecharSimbadNameSimbad column added by the CDSmeta.idchar_RAPosition from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPosition from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/AJ/153/174/table3*APOGEE B-type emission-line (ABE) star summaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintABEIdentifier of the Apache Point Observatory Galactic Evolution Experiment (APOGEE) B-type emission-line (ABE) star (running number) (G1)meta.idcharNameStar namemeta.id;meta.maincharNewIndicates an additional new Be star from APOGEE1 (table1)meta.ref.urlcharVisitVisit identifier (ap#-Plate-MJD-Fiber) (1)meta.id;obscharDateUT date of mid-observation (ISO 8601 date time)stime.epochnullableMJD[55701.9/57701.6] Modified Julian Date (MJD) of mid-observation (JD-2400000.5)dtime.epochdoubleS/N[41/1427] APOGEE spectra Signal-to-Noise ratiostat.snrintPSep[0/629]? Br11 peak separation (G2)km/sphys.veloc;arith.diffintnullableEW[-18.4/6.4]? Br11 equivalent width W_Br11_ (in {AA}) (G3)0.1nmspect.line.eqWidthfloatnullableRV[-95.3/98.3]? Radial velocity derived from the H-Br lines (G4)km/sphys.veloc;pos.heliocentricfloatnullablee_RV[0.1/22.9]? Standard deviation ({sigma}) of line-by-line radial velocitieskm/sstat.errorfloatnullableo_RV[3/9]? Number of H-Br lines used for RV (G5)meta.numberintnullableRVTypeType of radial velocity measurement, as described in Section 3.4 (single, double, or shell) (G6)meta.notechar