NEW RED JEWELS IN COMA BERENICES

作者：Terrien Ryan C^*; Mahadevan Suvrath; Deshpande Rohit; Bender Chad F; Cargile Phillip A; Hearty Frederick R; Cottaar Michiel; Allende Prieto Carlos; Fleming Scott W; Frinchaboy Peter M; Jackson Kelly M; Johnson Jennifer A; Majewski Steven R; Nidever David L; Pepper Joshua; Rodriguez Joseph E; Schneider Donald P; Siverd Robert J; Stassun Keivan G; Weaver Benjamin A; Wilson John C

来源：Astrophysical Journal, 2014, 782(2): 61.

DOI：10.1088/0004-637X/782/2/61

• binaries: spectroscopic
• open clusters and associations: individual (Coma Berenices)
• stars: late-type
• techniques: photometric
• techniques: radial velocities
• techniques: spectroscopic

We have used Sloan Digital Sky Survey-III (SDSS-III) Apache Point Observatory Galactic Evolution Experiment (APOGEE) radial velocity observations in the near-infrared H-band to explore the membership of the nearby (86.7 +/- 0.9 pc) open cluster Coma Berenices (Melotte 111), concentrating on the poorly populated low-mass end of the main sequence. Using SDSS-III APOGEE radial velocity measurements, we confirm the membership of eight K/M dwarf members, providing the first confirmed low-mass members of the Coma Berenices cluster. Using R similar to 2000 spectra from IRTF-SpeX, we confirm the independently luminosity classes of these targets, and find their metallicities to be consistent with the known solar mean metallicity of Coma Berenices and of M dwarfs in the solar neighborhood. In addition, the APOGEE spectra have enabled measurement of v sin i for each target and detection for the first time of the low-mass secondary components of the known binary systems Melotte 111 102 and Melotte 111 120, as well as identification of the previously unknown binary system 2MASS J12214070+2707510. Finally, we use Kilodegree Extremely Little Telescope photometry to measure photometric variability and rotation periods for a subset of the Coma Berenices members.

• 出版日期2014-2-20