J/other/RAA/15.1182   M Dwarf catalog of LAMOST DR1          (Guo+, 2015)

M Dwarf catalog of LAMOST general survey data release one. Guo Y.-X., Yi Z.-P., Luo A.-L., Wang Y.-F., Bai Y., Yang H.-F., Song Y.-H., Chen J.-J., Chen X.-Y., Zuo F., Du B., Zhang J.-N., Li Y.-B., Kong X., Wang M.-X., Wu Y., Wu K.-F., Zhao Y.-H., Zhang Y., Hou Y.-H., Wang Y.-F., Yang M. <Res. Astron. Astrophys., 15, 1182 (2015)> =2015RAA....15.1182G 2015RAA....15.1182G (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, dwarfs ; Stars, M-type ; Stars, peculiar Keywords: catalogs - methods: analytical - stars: statistical - stars: late-type - stars: magnetic-activity - stars Abstract: We present a spectroscopic catalog of 93 619 M dwarfs from the first data release of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) general survey. During sample selection, M giant contamination was eliminated using 2MASS photometry and CaH/TiO molecular indices. For each spectrum, the spectral subtype and values are provided including radial velocity, Hα equivalent width, a series of prominent molecular band indices, and the metal-sensitive parameter ζ, as well as distances and the space motions for high S/N objects. In addition, Hα emission lines are measured to examine the magnetic activity properties of M dwarfs and 7179 active ones are found. In particular, a subsample with significant variation in magnetic activity is revealed through observations from different epochs. Finally, statistical analysis for this sample is performed, including the metallicity classification, the distribution of molecular band indices and their errors. Description: We present a spectroscopic M dwarf catalog from LAMOST DR1, which consists of 110321 M dwarf spectra of 93619 objects. Our catalog not only includes the spectral subtypes, RVs, EWs of Hα, magnetic activity, nine molecular band indices and their errors, and metal-sensitive parameter ζ, but also provides 2MASS photometric information. Their distances and space motions (U, V, W) are also available for high S/N objects. Using a sample of more than 120000 candidates from the LAMOST spectroscopic database, we combine the 2MASS infrared photometry and CaH/TiO5 ratio to eliminate possible M giant contamination. By examining the distributions of S/N, magnitude and spectral subtype, as well as RV, we gain an overall understanding of M dwarfs in LAMOST DR1. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file dr1mcat.dat 640 110321 Spectroscopic M dwarf catalog from LAMOST DR1 -------------------------------------------------------------------------------- See also: V/146 : LAMOST DR1 catalogs (Luo+, 2015) Byte-by-byte Description of file: dr1mcat.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 I9 --- ObsID Obs ID 11- 20 A10 "date" Obs.Date Observation date 22- 26 I5 d LMJD Local Modified Julian Day 28- 47 A20 --- PlanId Plan Name 49- 50 I2 --- spId Spectrograph ID 52- 54 I3 --- FiberID Fiber ID 56- 69 F14.10 deg RAdeg Right Ascension (J2000) 71- 83 F13.10 deg DEdeg Declination (J2000) 85- 89 F5.2 --- snru ? Signal Noise Ratio of u filter 91- 98 F8.2 --- snrg ? Signal Noise Ratio of g filter 100-107 F8.2 --- snrr ? Signal Noise Ratio of r filter 109-116 F8.2 --- snri ? Signal Noise Ratio of i filter 118-125 F8.2 --- snrz ? Signal Noise Ratio of z filter 127-136 A10 --- objType Object Type 138-142 A5 --- FiberType Fiber Type of target (Obj, Sky, F-std, Unused, PosErr, Dead) 144-162 A19 --- Name Designation (JHHMMSS.ss+DDMMSS.s) 164-173 A10 --- magType Target Magnitude Type 175-179 F5.2 mag mag1 ?=99 Associated Magnitude 1 181-185 F5.2 mag mag2 ?=99 Associated Magnitude 2 187-191 F5.2 mag mag3 ?=99 Associated Magnitude 3 193-197 F5.2 mag mag4 ?=99 Associated Magnitude 4 199-203 F5.2 mag mag5 ?=99 Associated Magnitude 5 205-209 F5.2 mag mag6 ?=99 Associated Magnitude 6 211-215 F5.2 mag mag7 ?=99 Associated Magnitude 7 217-226 A10 --- tsource Organization or person who submits input catalog 228-245 A18 --- tfrom Input catalog submitted by an organization or a person determined by the tsource 247-269 A23 --- tInfo Target ID from SDSS, UCAC4, PANSTAR and other catalogue 271-282 F12.6 km/s RV ? Heliocentric Radial Velocity 284-295 F12.6 km/s e_RV ? Uncertainty of Heliocentric Radial Velocity 297-308 F12.6 0.1nm EWHa Hα equivalent width 310-322 F13.6 0.1nm e_EWHa ?=-9999 rms uncertainty on EWHA 324-335 F12.6 --- S/N ?=-9999 Halpha signal-to-noise ratio (sn) 337-348 F12.6 --- S/N1 ?=-9999 Second signal-to-noise ratio (sn1) 350-361 F12.6 --- Zeta ?=-9999 Metal-sensitive parameter 363-374 F12.6 --- e_Zeta ?=-9999 rms uncertainty on Zeta 376-387 F12.6 --- MA [0/1]?=-9999 Magnetic activity, 1 for yes 389-400 F12.6 --- CaH1 ?=-9999 CaH1 index 402-413 F12.6 --- CaH2 ?=-9999 CaH2 index 415-426 F12.6 --- CaH3 ?=-9999 CaH3 index 428-439 F12.6 --- TiO1 ?=-9999 TiO1 index 441-452 F12.6 --- TiO2 ?=-9999 TiO2 index 454-465 F12.6 --- TiO3 ?=-9999 TiO3 index 467-478 F12.6 --- TiO4 ?=-9999 TiO4 index 480-491 F12.6 --- TiO5 ?=-9999 TiO5 index 493-504 F12.6 --- e_CaH1 ?=-9999 rms uncertainty on CaH1 506-517 F12.6 ---- e_CaH2 ?=-9999 rms uncertainty on CaH2 519-530 F12.6 --- e_CaH3 ?=-9999 rms uncertainty on CaH3 532-544 F13.6 --- e_TiO1 ?=-9999 rms uncertainty on TiO1 546-557 F12.6 --- e_TiO2 ?=-9999 rms uncertainty on TiO2 559-571 F13.6 --- e_TiO3 ?=-9999 rms uncertainty on TiO3 573-584 F12.6 --- e_TiO4 ?=-9999 rms uncertainty on TiO4 586-597 F12.6 --- e_TiO5 ?=-9999 rms uncertainty on TiO5 599-607 F9.4 km/s Uvel ?=- U velocity 611-619 F9.4 km/s Vvel ?=- V velocity 623-631 F9.4 km/s Wvel ?=- W velocity 633-640 F8.4 pc Dist ?=- Distance -------------------------------------------------------------------------------- History: Copied at http://paperdata.china-vo.org/Guoyx/2015/DR1_M_catalog.txt
(End) Patricia Vannier [CDS] 19-Jan-2016
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