M-subdwarf research. I. LAMOST DR4 spectra obs. J/ApJS/240/31 ivo://CDS.VizieR/J/ApJS/240/31 doi:10.26093/cds/vizier.22400031 CDS Zhang S. Luo A.-L. Comte G. Gizis J.E. Wang R. Li Y. Qin Li Kong X.,Bai Y. Yi Z. 2019-11-22T14:09:47Z 2019-08-09T10:34:35Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr radial-velocity visible-astronomy spectroscopy m-stars infrared-photometry broad-band-photometry proper-motions trigonometric-parallax late-type-stars We propose a revision of the system developed by Lepine+ (2007ApJ...669.1235L) for spectroscopic M-subdwarf classification. Based on an analysis of subdwarf spectra and templates from Savcheva+ (2014ApJ...794..145S), we show that the CaH1 feature originally proposed by Gizis (1997, J/AJ/113/806) is important in selecting reliable cool subdwarf spectra. This index should be used in combination with the [TiO5, CaH2+CaH3] relation provided by Lepine+ to avoid misclassification results. In the new system, the dwarf-subdwarf separators are first derived from a sample of more than 80000 M dwarfs and a "labeled" subdwarf subsample, and these objects are all visually identified from their optical spectra. Based on these two samples, we refit the initial [TiO5, CaH1] relation and propose a new [CaOH, CaH1] relation supplementing the [TiO5, CaH1] relation to reduce the impact of uncertainty in flux calibration on classification accuracy. In addition, we recalibrate the {zeta}TiO/CaH parameter defined in Lepine+ to enable its successful application to Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectra. Using this new system, we select candidates from LAMOST Data Release 4 and finally identify a set of 2791 new M-subdwarf stars, covering the spectral sequence from type M0 to M7. This sample contains a large number of objects located at low Galactic latitudes, especially in the Galactic anti-center direction, expanding beyond previously published halo- and thick disk-dominated samples. Besides, we detect magnetic activity in 141 objects. We present a catalog for this M-subdwarf sample, including radial velocities, spectral indices and errors, and activity flags, with a compilation of external data (photometric and Gaia Data Release 2 astrometric parameters). 2019ApJS..240...31Z https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/240/31 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997) I/298 : LSPM-North Catalog (Lepine+ 2005) I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018) I/345 : Gaia DR2 (Gaia Collaboration, 2018) V/146 : LAMOST DR1 catalogs (Luo+, 2015) V/153 : LAMOST DR4 catalogs (Luo+, 2018) J/AJ/113/806 : M-Subdwarfs (Gizis 1997) J/AJ/125/1598 : New high PM stars in the northern sky (Lepine+, 2003) J/AJ/128/426 : Subdwarfs in the SDSS (West+, 2004) J/AJ/134/2398 : Stellar SEDs in SDSS and 2MASS filters (Covey+, 2007) J/AJ/141/97 : SDSS DR7 M dwarfs (West+, 2011) J/AJ/143/67 : SLoWPoKES. II. Wide, low-mass binaries (Dhital+, 2012) J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012) J/AJ/145/102 : Spectrosc. of bright M dwarfs in northern sky (Lepine+, 2013) J/A+A/556/A15 : Effective temperature scale of M dwarfs (Rajpurohit+, 2013) J/ApJ/783/122 : AllWISE motion survey (Kirkpatrick+, 2014) J/other/RAA/16.G7 : Nearby M subdwarfs from LAMOST DR2 (Bai+, 2016) J/ApJS/224/36 : The AllWISE motion survey (AllWISE2) (Kirkpatrick+, 2016) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/240/31 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/240/31 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/240/31 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/240/31 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/240/31 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/240/31 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/240/31/table4 (The subdwarf catalog) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/240/31/table4? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/240/31/table4? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/240/31/table4? GET text/xml+votable 180.0 50000 true 6.38073694 35.92401694 0.005555555555555556 5/94 95 124 218 278 280 539 643 647 649 664 1244 1317 1320 1569 1571 1575 1576 1672 4447 4468 5881 6014 6015 6099 6101 7102 7103 7121 7123 6/1 6 7 8 9 14 22 27 32 35 36 38 43 44 46 47 52 55 61 63 73 75 99 102 104 114 130 139 140 147 170 171 176 198 216 219 220 222 254 286 287 307 309 316 319 320 321 322 324 327 328 333 334 336 338 339 340 344 346 348 349 356 361 363 371 403 411 412 413 415 436 439 445 457 458 467 469 473 479 483 484 485 488 490 491 494 500 503 505 507 508 510 553 604 657 658 667 687 709 718 730 731 763 766 780 784 786 788 791 792 794 795 798 799 804 805 807 815 817 821 822 823 826 827 828 829 830 832 833 835 836 837 841 842 851 864 865 867 868 877 880 885 886 891 893 902 905 914 919 920 921 961 963 965 967 970 972 974 992 993 1027 1035 1064 1076 1085 1086 1088 1092 1095 1099 1100 1104 1107 1111 1116 1127 1134 1135 1138 1145 1150 1152 1153 1160 1161 1163 1165 1167 1168 1170 1171 1173 1179 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28392 28393 28397 28398 28399 28402 28404 28405 28420 28441 28447 28463 28465 28466 28467 28470 28473 28474 28478 28479 28481 28482 28483 28489 28491 28498 28504 28506 28507 28510 28512 28513 28515 28519 28524 28525 28528 28529 28534 28536 28538 28541 28543 28550 28557 28558 28561 28562 28563 28566 28567 28568 28569 28570 28575 28577 28578 28579 28580 28582 28583 28585 28589 28595 28600 28607 28611 28612 28615 28617 28624 28631 31039 31254 31260 31297 31303 31323 31380 31402 31437 31463 31474 31921 32289 32299 32315 32472 32475 32476 32477 32502 32507 32647 36718 36728 36730 36732 36816 36822 36839 36845 36851 36852 36857 40895 40919 40921 40928 40930 40931 40938 40951 45038 48999 49004 49018 49109 8.157980699529898e-21 4.670716440110116e-19 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/240/31?format=ascii Optical Infrared default J/ApJS/240/31/table4 The subdwarf catalog TiO5 [0.3/1.6] This work spectral index of TiO5 band spect.index float recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int LAMOST Target identifier (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char FITS LAMOST FITS spectrum name meta.id;meta.file char MJD [55859/57541] Modified Julian Date of LAMOST observation d time.epoch int Plan LAMOST Plan name obs.field char SpID [1/16] LAMOST Spectrograph identifier meta.id;instr int Fiber [1/250] LAMOST Fiber identifier meta.id int RAJ2000 Right Ascension in decimal degrees (J2000) deg pos.eq.ra;meta.main DEJ2000 Declination in decimal degrees (J2000) deg pos.eq.dec;meta.main GLON Galactic longitude deg pos.galactic.lon GLAT Galactic latitude deg pos.galactic.lat double SNRr [0.4/360] Average spectrum SNR in LAMOST r band stat.snr;em.opt.R float SNRi [1/815] Average spectrum SNR in LAMOST i band stat.snr;em.opt.I float HRV [-449/524] Heliocentric radial velocity; this work km/s spect.dopplerVeloc;pos.heliocentric int e_HRV [0/68] Standard error in HRV km/s stat.error int CaOH [-2.2/1.2] This work spectral index of CaOH band spect.index float e_CaOH [0.001/1.6]? Error in CaOH (1) stat.error float nullable CaH1 [0.04/1] This work spectral index of CaH1 band spect.index float e_CaH1 [0.001/0.8]? Error in CaH1 (1) stat.error float nullable CaH2 [0.1/1] This work spectral index of CaH2 band spect.index float e_CaH2 [0.001/0.3]? Error in CaH2 (1) stat.error float nullable CaH3 [0.3/1] This work spectral index of CaH3 band spect.index float e_CaH3 [0.001/0.4]? Error in CaH3 (1) stat.error float nullable e_TiO5 [0.001/0.4]? Error in TiO5 (1) stat.error float nullable Zeta [-2.3/0.9] Value of {Zeta} parameter stat.param float SpT [0/7] Spectral subtype; this work (2) src.spType int Act [-9999/1] H{alpha} emission tag (3) meta.code int Flag [*] Visual inspection of spectrum quality flag (4) meta.code.error char Plx [-2.5/42.6]? Gaia DR2 parallax mas pos.parallax.trig float nullable e_Plx [0.01/1.2]? Standard error in Plx mas stat.error;pos.parallax float nullable pmRA [-405.1/343.3]? Gaia DR2 proper motion along RA mas/yr pos.pm;pos.eq.ra double nullable e_pmRA [0.01/2]? Standard error in pmRA mas/yr stat.error;pos.pm;pos.eq.ra float nullable pmDE [-407.4/188]? Gaia DR2 proper motion along DE mas/yr pos.pm;pos.eq.dec double nullable e_pmDE [0.02/2.1]? Standard error in pmDE mas/yr stat.error;pos.pm;pos.eq.dec float nullable Gmag [9.7/20.4]? Mean Gaia DR2 G-band magnitude mag phot.mag;em.opt double nullable BPmag [11.8/21.5]? Mean Gaia DR2 BP magnitude mag phot.mag;em.opt.B double nullable RPmag [8.5/19.6]? Mean Gaia DR2 RP magnitude mag phot.mag;em.opt.R double nullable BP-RP [0.4/4.5]? Gaia DR2 (BP-RP) color index mag phot.color;em.opt.B;em.opt.R double nullable Dist [26.7/4173]? Estimated distance (5) pc pos.distance;pos.heliocentric double nullable b_Dist [26.7/3174]? Lower confidence interval boundary on Dist pc stat.fit.param double nullable B_Dist [26.8/5875]? Upper confidence interval boundary on Dist pc stat.fit.param double nullable rlen [335.4/1741]? Length scale used in the prior for distance estimation pc pos.distance;instr.setup double nullable gmag [12.3/22]? Mean Pan-STARRS1 g band PSF AB magnitude mag phot.mag;em.opt.B float nullable e_gmag [0/0.3]? Error in gmag mag stat.error;phot.mag;em.opt.B float nullable rmag [10.7/20.5]? Mean Pan-STARRS1 r band PSF AB magnitude mag phot.mag;em.opt.R float nullable e_rmag [0/0.06]? Error in rmag mag stat.error;phot.mag;em.opt.R float nullable imag [9/20]? Mean Pan-STARRS1 i band PSF AB magnitude mag phot.mag;em.opt.I float nullable e_imag [0/0.2]? Error in imag mag stat.error;phot.mag;em.opt.I float nullable zmag [8/20]? Mean Pan-STARRS1 z band PSF AB magnitude mag phot.mag;em.opt.I float nullable e_zmag [0/0.5]? Error in zmag mag stat.error;phot.mag;em.opt.I float nullable ymag [7.6/19.7]? Mean Pan-STARRS1 y band PSF AB magnitude mag phot.mag;em.IR.J float nullable e_ymag [0/0.2]? Error in ymag mag stat.error;phot.mag;em.IR float nullable Jmag [5.9/17]? Default 2MASS J band magnitude mag phot.mag;em.IR.J float nullable Hmag [4.8/17.2]? Default 2MASS H band magnitude mag phot.mag;em.IR.H float nullable Ksmag [4.4/16.1]? Default 2MASS Ks band magnitude mag phot.mag;em.IR.K float nullable e_Jmag [0.01/0.3]? Photometric uncertainty in Jmag mag stat.error;phot.mag;em.IR.J float nullable e_Hmag [0.01/0.3]? Photometric uncertainty in Hmag mag stat.error;phot.mag;em.IR.H float nullable e_Ksmag [0.01/0.3]? Photometric uncertainty in Ksmag mag stat.error;phot.mag;em.IR.K float nullable W1mag [4/17]? AllWISE W1 (3.4um) band standard aperture magnitude mag phot.mag;em.IR.3-4um float nullable W2mag [3.9/17]? AllWISE W2 (4.6um) band standard aperture magnitude mag phot.mag;em.IR.4-8um float nullable W3mag [3.6/13.4]? AllWISE W3 (12um) band standard aperture magnitude mag phot.flux.density;em.IR.8-15um float nullable W4mag [3.2/9.8]? AllWISE W4 (22um) band standard aperture magnitude mag phot.flux.density;em.IR.15-30um float nullable e_W1mag [0.02/0.4]? Uncertainty in W1mag mag stat.error;phot.mag float nullable e_W2mag [0.01/0.4]? Uncertainty in W2mag mag stat.error;phot.mag float nullable e_W3mag [0.01/0.6]? Uncertainty in W3mag mag stat.error;phot.mag float nullable e_W4mag [0.02/0.6]? Uncertainty in W4mag mag stat.error;phot.mag float nullable PS1 Display the Pan-STARRS1 data (II/349) within 1" meta.ref.url char WISEA Display the AllWISE data (II/328) within 1" meta.ref.url char Gaia Display the Gaia DR2 data (I/345 and I/347) within 1" for sources with Plx meta.ref.url char 2M Display the 2MASS data (II/246) within 3" meta.ref.url char