M-subdwarf research. II. Catalog of ~3000 subdwarfs J/ApJ/908/131 ivo://CDS.VizieR/J/ApJ/908/131 doi:10.26093/cds/vizier.19080131 CDS Zhang S. Luo A.-L. Comte G. Wang R. Li Y.-B. Du B. Hou W. Qin Li,Gizis J. Chen J.-J. Chen X.-L. Lu Y. Song Y.-H. Zhang H.-W. Zuo F. 2026-09-09T11:44:59Z 2024-02-29T08:32:26Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr m-stars subdwarf-stars visible-astronomy spectroscopy proper-motions radial-velocity trigonometric-parallax We applied the revised M subdwarf classification criteria discussed in Zhang+ 2019, J/ApJS/240/31 (Paper I) to Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR7 and combined the result with the M subdwarf sample from Savcheva+ 2014ApJ...794..145S to construct a new M subdwarf sample for further study. The atmospheric parameters for each object were derived from fitting to the PHOENIX grid, and the sources with available astrometry and photometry from Gaia DR2 were combined for further analysis. The relationship between the gravity and metallicity was explored according to the locus both in the color-absolute magnitude diagram and the reduced proper motion diagram. Objects that have both the largest gravity and the lowest metallicity are located away from the main-sequence cloud and may be considered as the intrinsic M subdwarfs, which can be classified as luminosity class VI. Another group of objects whose spectra show typical M subdwarf characteristics have lower gravity and relatively moderate metal deficiency and occupy part of the ordinary M dwarf region in both diagrams. The Galactic U, V, W space velocity components and their dispersion show that the local Galactic halo population sampled in the solar neighborhood is represented by objects of high gravity and an inconspicuous bimodal metallicity distribution, with a fraction of prograde orbits. The other M subdwarfs seem to belong in part to the thick disk component, with a significant fraction of thin disk, moderately metal-poor objects intricately mixed with them. However, selection effects, especially the favored anticenter direction of investigation in the LAMOST subsample, as well as contamination by multiplicity and parameter coupling, could play important roles and need to be investigated further. 2021ApJ...908..131Z https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/908/131 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VII/195 : Globular Clusters in the Milky Way (Harris, 1996) VII/202 : Globular Clusters in the Milky Way (Harris, 1997) III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997) II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) I/345 : Gaia DR2 (Gaia Collaboration, 2018) I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018) V/156 : LAMOST DR7 catalogs (Luo+, 2019) V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020) I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) J/AJ/113/806 : M-Subdwarfs (Gizis 1997) J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003) J/AJ/125/1598 : High proper motion stars in northern sky (Lepine+, 2003) J/MNRAS/340/304 : [X/Fe] of Galactic disc F and G dwarfs (Reddy+, 2003) J/PASP/115/22 : Stellar parameters for 134 cool subdwarfs (Yong+, 2003) J/AJ/128/426 : Subdwarfs in the SDSS (West+, 2004) J/AJ/130/1658 : High proper motion stars (-47<delta<00) (Subasavage+, 2005) J/AJ/137/1 : Proper motions & astrom late-type dwarfs (Faherty+, 2009) J/AJ/143/67 : SLoWPoKES. II. Prop wide, low-mass binaries (Dhital+, 2012) J/AJ/145/102 : Spectro of bright Mdwarfs in northern sky (Lepine+, 2013) J/A+A/564/A90 : Msubdwarfs VLT/UVES high res spectra (Rajpurohit+, 2014) J/AJ/150/42 : Catalog of 2612 M dwarfs from LAMOST (Zhong+, 2015) J/ApJ/804/30 : Robo-AO observed cool subdwarf companions (Ziegler+, 2015) J/other/RAA/16.G7 : Nearby M subdwarfs from LAMOST DR2 (Bai+, 2016) J/ApJ/836/77 : Library of high-S/N opt spectra of FGKM stars (Yee+, 2017) J/A+A/616/A10 : 46 open clusters GaiaDR2 diagram (Gaia Collaboration, 2018) J/A+A/620/A180 : Stellar properties of M dwarfs (Rajpurohit+, 2018) J/MNRAS/480/5447 : New L subdwarfs, population properties (Zhang+, 2018) J/AJ/157/63 : Rad relations low-metallicity Mdwarf stars (Kesseli+, 2019) J/ApJS/240/31 : Msubdwarf research. I. LAMOST DR4 obs. (Zhang+, 2019) J/AJ/159/30 : High proper-motion M-type stars spectro (Hejazi+, 2020) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/908/131 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/908/131 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/908/131 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/908/131 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/908/131 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/908/131 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/908/131/table4 (Subdwarf catalog) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/908/131/table4? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/908/131/table4? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/908/131/table4? 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recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ID Designation for the stellar object (1) meta.id;meta.main GLON [0/360] Galactic longitude deg pos.galactic.lon Vtot [2.88/4773]? Total spacial velocity km/s phys.veloc float nullable Z [-1658/2172]? Vertical distance away from Galactic plane pc pos.cartesian.z;pos.galactic double nullable U [-745/3630]? Velocity component points towards the galactic center km/s phys.veloc;pos.cartesian.x float nullable V [-2459/153]? The tangential velocity component rotating around galactic center km/s phys.veloc;pos.cartesian.y double nullable SimbadName Simbad column added by the CDS meta.id char nullable RAJ2000 Right Ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 [-18/79] Declination (J2000) deg pos.eq.dec;meta.main GLAT [-80/89] Galactic latitude deg pos.galactic.lat double HRV [-300/299]? Heliocentric radial velocity km/s spect.dopplerVeloc;pos.heliocentric float nullable Teff [2800/4500]? Estimated effective temperature K phys.temperature.effective float nullable logg [2/5.94]? Estimated surface gravity log(cm.s**-2) phys.gravity double nullable [Fe/H] [-2.5/0.44]? Estimated overall metallicity phys.abund.Z double nullable SNRi [2/207] Average spectrum signal to noise ratio in i band stat.snr;stat.mean;em.opt.I float SpT [-2/9] Spectral subtype src.spType int CaOH [-0.62/1.36] Spectral index of CaOH band spect.index double CaH1 [0.0002/1.19] Spectral index of CaH1 band spect.index double CaH2 [0.14/0.89] Spectral index of CaH2 band spect.index double CaH3 [0.23/1.04] Spectral index of CaH3 band spect.index double TiO5 [0.3/1.43] Spectral index of TiO5 band spect.index double ZetaL07 [-2.04/0.91] The value of Zeta parameter calibrated by Lepine+, 2007ApJ...669.1235L stat.fit.param float ZetaD12 [-1.26/0.79] The value of Zeta parameter calibrated by Dhital+, 2012, J/AJ/143/67 stat.fit.param float ZetaL13 [-2.11/0.83] The value of Zeta parameter calibrated by Lepine+, 2013, J/AJ/145/102 stat.fit.param float ZetaZ19 [-1.51/0.75] The value of Zeta parameter calibrated by Zhang+ 2019, J/ApJS/240/31 (Paper I) stat.fit.param float plx [-6.75/132]? Gaia DR2 parallax mas pos.parallax.trig double nullable e_plx [0.01/3]? Standard error of Gaia DR2 parallax mas stat.error;pos.parallax float nullable pmRA [-6428/1128]? Gaia DR2 proper motion in right ascension direction mas/yr pos.pm;pos.eq.ra double nullable e_pmRA [0.01/5]? Standard error of Gaia DR2 proper motion in right ascension direction mas/yr stat.error;pos.pm;pos.eq.ra float nullable pmDE [-1074/253]? Gaia DR2 proper motion in declination direction mas/yr pos.pm;pos.eq.dec double nullable e_pmDE [0.01/4]? Standard error of Gaia DR2 proper motion in declination direction mas/yr stat.error;pos.pm;pos.eq.dec float nullable Good [-4.7/551]? Goodness of fit statistic of model wrt along-scan observations stat.fit.goodness float nullable Sig [0/87996]? Significance of excess noise instr.det.noise double nullable GFluxE [46.3/5633]? G-band mean flux divided by its error (phot-g-mean-flux-over-error) mag phot.flux.density;em.opt;arith.diff float nullable Gmag [8.2/21.3]? Gaia DR2 G-band mean magnitude mag phot.mag;em.opt float nullable BpFluxE [0.89/987]? Integrated BP mean flux divided by its error mag phot.flux.density;em.opt.B;arith.diff float nullable Bpmag [9.28/22.2]? Gaia DR2 integrated BP mean magnitude mag phot.mag;em.opt.B float nullable RpFluxE [6.19/1938]? Integrated RP mean flux divided by its error mag phot.flux.density;em.opt.R float nullable Rpmag [7.19/20]? Gaia DR2 integrated RP mean magnitude mag phot.mag;em.opt.R float nullable Bp-Rp [0.62/3.17]? Gaia DR2 BP-RP color mag phot.color;em.opt.B;em.opt.R float nullable RUWE [0.77/37.2]? Renormalized Unit Weight Error associated to each Gaia source stat.error float nullable Rest [43.9/3757]? Estimated distance from Gaia DR2 pc pos.distance float nullable ResFl [1]? The Result Flag from Gaia DR2 meta.code float nullable ModFl [1]? The Modality Flag from Gaia DR2 meta.code float nullable Flag [0/1]? Set as 1 for the final sample used in kinematic part, see table 3 for details meta.code.error float nullable W [-314/1898]? Velocity component points to wards the north galactic pole km/s phys.veloc;pos.cartesian.z float nullable Sloan Display the online SDSS-DR17 data for the nearest object meta.ref.url char GaiaDR2 Display the Gaia DR2 (I/345) within 1" meta.ref.url char Inst The source of spectrum ("lamost" or "sdss") meta.id;instr char SpecID Name of spectrum meta.id char