Candidate members of star clusters from LAMOST DR2

In this work, we provide 2189 photometrically- and kinematically-selected candidate members of 24 star clusters from the LAMOST DR2 catalog. We perform two-step membership identification: selection along the stellar track in the color-magnitude diagram, i.e., photometric identification, and selection from the distribution of radial velocities, i.e. the kinematic identification. We find that the radial velocities from the LAMOST data are very helpful in the membership identification. The mean probability of membership is 40% for the sample selected with radial velocity. With these 24 star clusters, we investigate the performance of the radial velocity and metallicity estimated with the LAMOST pipeline. We find that the systematic offsets in radial velocity and metallicity are 0.85 ± 1.26 km s−1 and −0.08 ± 0.04 dex, with dispersions of 5.47+1.16−0.71 km s−1 and 0.13+0.04−0.02 dex, respectively. Finally, we propose that the photometrically-selected candidate members of the clusters covered by the LAMOST footprint should be assigned higher priority so that more candidate stars can be observed.

[1]  Xu Zhou,et al.  The first data release (DR1) of the LAMOST regular survey , 2015 .

[2]  Gang Zhao,et al.  Preface: The LAMOST Galactic surveys and early results , 2015 .

[3]  G. Zhao,et al.  The First Data Release (DR1) of the LAMOST general survey , 2015, 1505.01570.

[4]  Bingqiu Chen,et al.  LAMOST Spectroscopic Survey of the Galactic Anticentre (LSS-GAC): target selection and the first release of value-added catalogues , 2014, 1412.6628.

[5]  Bingqiu Chen,et al.  The LAMOST stellar parameter pipeline at Peking University – lsp3 , 2014, 1412.6627.

[6]  Chao Liu,et al.  THE BINARITY OF MILKY WAY F,G,K STARS AS A FUNCTION OF EFFECTIVE TEMPERATURE AND METALLICITY , 2014, 1405.7105.

[7]  B. Gibson,et al.  A RAVE investigation on Galactic open clusters , 2013, Astronomy & Astrophysics.

[8]  N. V. Kharchenko,et al.  Global survey of star clusters in the Milky Way II. The catalogue of basic parameters , 2013, 1308.5822.

[9]  T. Beers,et al.  THE OPEN CLUSTER CHEMICAL ANALYSIS AND MAPPING SURVEY: LOCAL GALACTIC METALLICITY GRADIENT WITH APOGEE USING SDSS DR10 , 2013, 1308.4195.

[10]  H. Rix,et al.  THE SEGUE K GIANT SURVEY. II. A CATALOG OF DISTANCE DETERMINATIONS FOR THE SEGUE K GIANTS IN THE GALACTIC HALO , 2012, 1211.0549.

[11]  Haibo Yuan,et al.  The assembly of the Milky Way and its satellite galaxies , 2012 .

[12]  Yong-Heng Zhao,et al.  LAMOST spectral survey — An overview , 2012 .

[13]  S. Roser,et al.  Global survey of star clusters in the Milky Way - I. The pipeline and fundamental parameters in the second quadrant , 2012, 1207.4001.

[14]  Heidi Jo Newberg,et al.  LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) — The survey's science plan , 2012, 1206.3578.

[15]  R. J. Wainscoat,et al.  THE Pan-STARRS1 PHOTOMETRIC SYSTEM , 2012, 1203.0297.

[16]  Xu Zhou,et al.  Independent Determination of the Systematic and Random Errors of the Proper Motions in the PPMXL Catalogue Using Quasars , 2011, 1110.1153.

[17]  Yanchun Liang,et al.  Automatic determination of stellar atmospheric parameters and construction of stellar spectral templates of the Guoshoujing Telescope (LAMOST) , 2011, 1105.2681.

[18]  Harinder P. Singh,et al.  Coudé-feed stellar spectral library – atmospheric parameters , 2010, 1009.1491.

[19]  E. Schilbach,et al.  THE PPMXL CATALOG OF POSITIONS AND PROPER MOTIONS ON THE ICRS. COMBINING USNO-B1.0 AND THE TWO MICRON ALL SKY SURVEY (2MASS) , 2010, 1003.5852.

[20]  R. Grijs.  A revolution in star cluster research: setting the scene , 2009, 0911.0778.

[21]  K. Cheng,et al.  The eighth Pacific Rim conference on stellar astrophysics : a tribute to Kam-Ching Leung : proceedings of a workshop held at Merlin Beach Hotel, Phuket, Thailand, 5-9 May 2008 , 2009 .

[22]  P. Frinchaboy,et al.  OPEN CLUSTERS AS GALACTIC DISK TRACERS. I. PROJECT MOTIVATION, CLUSTER MEMBERSHIP, AND BULK THREE-DIMENSIONAL KINEMATICS , 2008, 0804.4630.

[23]  Australian National University,et al.  THE SEGUE STELLAR PARAMETER PIPELINE. II. VALIDATION WITH GALACTIC GLOBULAR AND OPEN CLUSTERS , 2007, 0710.5778.

[24]  Olivier Bienayme,et al.  THE RADIAL VELOCITY EXPERIMENT (RAVE): FIFTH DATA RELEASE , 2013, 1609.03210.

[25]  M. Skrutskie,et al.  The Two Micron All Sky Survey (2MASS) , 2006 .

[26]  Brazil.,et al.  New infrared star clusters in the Northern and Equatorial Milky Way with 2MASS , 2003, astro-ph/0304379.

[27]  Brazil,et al.  New infrared star clusters in the southern Milky Way with 2MASS , 2003, astro-ph/0301221.

[28]  Brazil.,et al.  A Catalogue of infrared star clusters and stellar groups , 2002, astro-ph/0210302.

[29]  R. Zinn,et al.  Compositions of halo clusters and the formation of the galactic halo , 1978 .