New Red Jewels in Coma Berenices

Abstract

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 ($86.7\pm 0.9$ 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 $R\sim 2000$ 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 (KELT) photometry to measure photometric variability and rotation periods for a subset of the Coma Berenices members.

13 pages, 10 figures, accepted to ApJ

References in corpus (10)

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• The Dartmouth Stellar Evolution Database
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• APOGEE: The Apache Point Observatory Galactic Evolution Experiment
• Reevaluating the Mass-Radius Relation for Low-Mass, Main Sequence Stars
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Cited by in corpus (12)

• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• The evolution of surface magnetic fields in young solar-type stars II: The early main sequence (250-650 Myr)
• Discovery and Characterization of 3000+ Main-Sequence Binaries from APOGEE Spectra
• IN-SYNC I: Homogeneous Stellar Parameters from High Resolution APOGEE Spectra for Thousands of Pre-main Sequence Star
• A Near-Infrared Spectroscopic Survey of 886 Nearby M Dwarfs
• Characterization of Stellar and Substellar Members in the Coma Berenices Star Cluster
• A metallicity study of F, G, K and M dwarfs in the Coma Berenices open cluster from the APOGEE survey
• KELT: The Kilodegree Extremely Little Telescope, a Survey for Exoplanets Transiting Bright, Hot Stars
• The SDSS-HET Survey of Kepler Eclipsing Binaries. Description of the Survey and First Results
• Precise Age for the Binary Star System 12 Com in the Coma Berenices Cluster
• Photometric and spectroscopic observations of the neglected near-contact binary Cl* Melotte 111 AV 1224
• Searching for short-period variable stars in the direction of Coma Berenices and Upgren 1 open clusters: Melotte 111 AV 1224 a new eclipsing binary star