J/ApJS/253/22ivo://CDS.VizieR/J/ApJS/253/22doi:10.26093/cds/vizier.22530022CDSXiang M.Rix H.-W.Ting Y.-S.Zari E.El-badry K.Yuan H.-B.,Cui W.-Y.2021-07-05T13:14:31Z2021-06-25T09:52:04ZCDS support team

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

cds-question@unistra.frob-starsradial-velocityabsolute-magnitudeproper-motionsstellar-distancevisible-astronomytrigonometric-parallaxinfrared-photometryWe present a data-driven method to estimate absolute magnitudes for O- and B-type stars from the LAMOST spectra, which we combine with Gaia DR2 parallaxes to infer distance and binarity. The method applies a neural network model trained on stars with precise Gaia parallax to the spectra and predicts K_s_-band absolute magnitudes M_Ks_ with a precision of 0.25mag, which corresponds to a precision of 12% in spectroscopic distance. For distant stars (e.g., >5kpc), the inclusion of constraints from spectroscopic M_Ks_ significantly improves the distance estimates compared to inferences from Gaia parallax alone. Our method accommodates for emission-line stars by first identifying them via principal component analysis reconstructions and then treating them separately for the M_Ks_ estimation. We also take into account unresolved binary/multiple stars, which we identify through deviations in the spectroscopic M_Ks_ from the geometric M_Ks_ inferred from Gaia parallax. This method of binary identification is particularly efficient for unresolved binaries with near equal-mass components and thus provides a useful supplementary way to identify unresolved binary or multiple-star systems. We present a catalog of spectroscopic M_Ks_, extinction, distance, flags for emission lines, and binary classification for 16002 OB stars from LAMOST DR5. As an illustration, we investigate the M_Ks_ of the enigmatic LB-1 system, which Liu et al. 2019Natur.575..618L had argued consists of a B star and a massive stellar-mass black hole. Our results suggest that LB-1 is a binary system that contains two luminous stars with comparable brightness, and the result is further supported by parallax from the Gaia eDR3.2021ApJS..253...22Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/253/22CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/116 : Galactic O star catalog (Maiz-apellaniz+, 2004)I/345 : Gaia DR2 (Gaia Collaboration, 2018)I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)J/ApJ/608/405 : Explosive yields of massive star (Chieffi+, 2004)J/A+A/423/755 : Color-Induced Displacement double SDSS stars (Pourbaix+, 2004)J/A+A/430/137 : Close visual companions in Scorpius OB2 (Kouwenhoven+, 2005)J/ApJ/663/320 : IR-through-UV extinction curve (Fitzpatrick+, 2007)J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)J/A+A/550/A107 : RV catalogue of O stars in 30 Doradus (Sana+, 2013)J/AJ/148/81 : APASS BVgri photometry of RAVE stars. I. Data (Munari+, 2014)J/ApJS/228/24 : GALAH semi-automated classification scheme (Traven+, 2017)J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)J/MNRAS/472/675 : Wide binaries in Tycho-Gaia: search method (Andrews+, 2017)J/A+A/608/A95 : GES: multi-line spectroscopic binary candidates (Merle+, 2017)J/A+A/615/A78 : Spectral models for binary products (Goetberg+, 2018)J/A+A/616/A10 : Open clusters Gaia DR2 HR diagrams (Gaia Collaboration, 2018)J/A+A/616/L15 : Parallaxes and Proper Motions of OB stars (Xu+, 2018)J/AJ/156/45 : M-dwarf multiples in the SDSS-III/APOGEE (Skinner+, 2018)J/A+A/623/A72 : Binarity of HIP stars from Gaia pm anomaly (Kervella+, 2019)J/ApJS/241/32 : OB stars from the LAMOST DR5 spectra (Liu+, 2019)J/AJ/158/147 : Spectrophotometric parallaxes with linear models (Hogg+, 2019)J/ApJS/245/34 : Abundances for 6 million stars from LAMOST DR5 (Xiang+, 2019)J/A+A/638/A76 : StarHorse data for 5 surveys (Queiroz+, 2020)J/A+A/638/A145 : GALAH survey. FGK binary stars (Traven+, 2020)J/A+A/639/L6 : HERMES spectra of LS V +22 25 (Shenar+, 2020)J/ApJS/249/22 : Radial velocity variable stars from LAMOST DR4 (Tian+, 2020)J/ApJS/249/31 : Short period spec. & EBs from LAMOST & PTF (Yang+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/253/22https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/253/22http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/253/22https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/253/22https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/253/22http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/253/22GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/253/22/table1 (Distance catalog for 16002 OB stars in LAMOST DR5)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/253/22/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/253/22/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/253/22/table1?GETtext/xml+votable180.050000true0.0594561150.818606940.0055555555555555563/28 347 374 380 4/80 81 83 84 85 86 89 90 91 92 101 103 109 110 111 120 121 122 187 188 198 199 201 901 923 1400 1402 1485 1487 1488 1490 1491 1500 1509 1511 1524 1529 1530 1531 1532 1534 5/93 260 272 274 279 306 311 313 315 319 328 329 331 348 351 353 354 355 374 376 377 378 382 399 421 429 431 433 434 435 467 492 493 639 710 725 727 732 734 743 756 774 775 780 781 783 784 785 786 788 801 808 810 811 813 814 815 816 832 834 840 896 897 898 900 901 1706 1707 1721 3180 3256 3262 3321 3322 3323 3467 3492 3493 3494 3533 3545 3547 3549 3550 3559 3564 3565 3568 3569 3570 3576 3597 3608 3650 3653 3655 3657 3661 3664 3670 3672 3673 3675 3676 3677 3678 3686 3688 3698 3699 3708 3780 3850 3857 3860 3862 3872 5433 5438 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31528 31546 31549 31550 31592 31612 31613 31622 31624 31627 31640 31715 31731 31746 31752 31755 31756 31764 31768 31773 31785 31788 31790 31798 31801 31812 31813 31816 31822 31844 31846 31854 31856 31859 31861 31875 31907 31923 31945 31948 31952 31956 31957 31959 31973 31985 32034 32061 32063 32099 32105 32129 32138 32148 32165 32167 32175 32187 32212 32241 32245 32269 32277 32330 32332 32372 32375 32380 32385 32431 32456 32458 32465 32486 32489 32502 32511 32515 32521 32537 32550 32551 32554 32558 32577 32606 32607 32644 32649 32658 32659 32664 32670 32674 32704 32719 32754 32758 36851 36857 36861 40882 40886 40919 40937 40939 40940 409488.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/253/22?format=asciiOpticalInfrareddefaultJ/ApJS/253/22/table1Distance catalog for 16002 OB stars in LAMOST DR5E(B-V)[0/2.6] The (B-V) color excessmagphot.color.excessfloate_logD[5e-5/1.3]? Uncertainty logDlog(kpc)stat.errordoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/27752] Index numbermeta.idintRAJ2000LAMOST DR5 Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000LAMOST DR5 Right Ascension in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedUniq[1/25] Flag to indicate repeat visits (1)meta.numberintSNR-g[0/999] Spectral signal-to-noise ratio per pixel in SDSS g-bandstat.snrfloatRVel[-707/999]? LAMOST radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RVel[0.1/999]? Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatnullableKsMag[-5.7/3.3]? Spectroscopic absolute Ks band magnitudemagphys.magAbsfloatnullablee_KsMag[0/100]? Uncertainty in KsMagmagstat.error;phot.magfloatnullableKsMaggeo[-11.3/12.3]? Geometric absolute Ks band magnitude (3)magphys.magAbsfloatnullablee_KsMaggeo[0.01/18]? Uncertainty in KsMaggeomagstat.errorfloatnullableDist[36/60775]? Distance at mode in cumulative probability distribution functionkpcpos.distancefloatnullablee_Dist[36/51274]? Lower 16% pdf value in Distkpcstat.errorfloatnullableE_Dist[37/86458]? Upper 84% pdf value in Distkpcstat.error;stat.maxfloatnullablelogD[1.5/4.8]? PDF-weighted mean log distancelog(kpc)pos.distance;stat.meandoublenullablee_E(B-V)[0.01/999] Uncertainty in E (B-V)magstat.errorfloatsnr-plx[-99/24] Excess in spectro-photometric parallax (4)stat.snrfloatBin[-9/1]? Flag of binarity (5)meta.codeintnullableem[0/1] Flag of emission lines (1=with emission lines)meta.codeintGaia? Gaia DR2 source identifiermeta.id.crossnullableplx[-12.4/27.1] Gaia DR2 parallaxmaspos.parallax.trigdoublee_plx[0/1.6] Uncertainty in plxmasstat.error;pos.parallaxfloatOffset[-0.056/0] Offset of Gaia parallax (7)maspos.parallax;arith.difffloatpmRA[-128/109] Gaia DR2 proper motion along RAmas/yrpos.pm;pos.eq.radoublee_pmRA[0/3.5] Uncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-125/48] Gaia DR2 proper motion along DEmas/yrpos.pm;pos.eq.decdoublee_pmDE[0/2.3] Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatruwe[-99/65] Gaia DR2 renormalised unit weight error (ruwe) valuestat.errorfloatJmag[5.4/16.9]? Apparent 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0/0.2] Uncertainty in Jmagmagstat.error;phot.magfloatHmag[4.8/17.8]? Apparent 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0/10] Uncertainty in Hmagmagstat.error;phot.magfloatKsmag[4.4/17.6]? Apparent 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0/10] Uncertainty in Ksmagmagstat.error;phot.magfloatX[-62.3/10.9] Cartesian coordinate X Galactic position (8)kpcpos.distance;pos.cartesian.x;pos.galacticfloatY[-16.1/37.6] Cartesian coordinate Y Galactic position (8)kpcpos.distance;pos.cartesian.y;pos.galacticfloatZ[-31.6/28.6] Cartesian coordinate Z Galactic position (8)kpcpos.distance;pos.cartesian.z;pos.galacticfloatspecIDLAMOST spectra identifier (9)meta.idcharFileNameName of the LAMOST spectral file in FITS formatmeta.idchar2MDisplay the 2MASS data (Cutri+ 2003, II/246) within 3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar