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Ultra-precise Masses and Magnitudes for the Gliese 268 M-dwarf Binary

Barry, R. K. and Demory, B. O. and Ségransan, D. and Forveille, T. and Danchi, W. C. and Di Folco, E. and Queloz, D. and Torres, G. and Traub, W. A. and Delfosse, X. and Mayor, M. and Perrier, C. and Udry, S. (2009) Ultra-precise Masses and Magnitudes for the Gliese 268 M-dwarf Binary. In: Cool Stars, Stellar Systems and the Sun. AIP Conference Proceedings. No.1094. American Institute of Physics , Melville, NY, pp. 780-783. ISBN 978-0-7354-0627-8.

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Recent advances in astrometry using interferometry and precision radial velocity techniques combined allow for a significant improvement in the precision of masses of M‐dwarf stars in visual systems. We report recent astrometric observations of Gliese 268, an M‐dwarf binary with a 10.4 day orbital period, with the IOTA interferometer and radial velocity observations with the ELODIE instrument. Combining these measurements leads to preliminary masses of the constituent stars with uncertainties of 0.4%. The masses of the components are 0.22596±0.00084 M_⊙ for the primary and 0.19230±0.00071 M_⊙ for the secondary. The system parallax is determined by these observations to be 0.1560±.0030 arcsec (2.0% uncertainty) and is within Hipparcos error bars (0.1572±.0033). We tested these physical parameters, along with the near‐infrared luminosities of the stars, against stellar evolution models for low‐mass stars. Discrepancies between the measured and theoretical values point toward a low‐level departure from the predictions. These results are among the most precise masses measured for visual binaries.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Demory, B. O.0000-0002-9355-5165
Queloz, D.0000-0002-3012-0316
Torres, G.0000-0002-5286-0251
Additional Information:© 2009 American Institute of Physics. Published online 16 February 2009. We are grateful to the National Aeronautics and Space Administration, the University of Grenoble Observatory, Jet Propulsion Laboratory, the California Association for Research in Astronomy, and to the Harvard-Smithsonian Center for Astrophysics for support of this research. We are also grateful for the work on software to reduce the interferometric data from IOTA by J. Monnier. BOD acknowledges the support of the Fonds National Suisse de la Recherche Scientifique. GT acknowledges partial support from NSF grant AST-0708229.
Funding AgencyGrant Number
California Association for Research in AstronomyUNSPECIFIED
Harvard-Smithsonian Center for AstrophysicsUNSPECIFIED
Fonds National Suisse de la Recherche ScientifiqueUNSPECIFIED
Subject Keywords:Low Mass Stars, Binary Stars, Normal Stars, Luminosity, Mass Function
Series Name:AIP Conference Proceedings
Issue or Number:1094
Classification Code:PACS: 95.10.Ce:95.10.Eg:97.10.-q:97.10.Nf:97.10.Xq:97.20.Jg: 97.80.Af:97.10.Vm
Record Number:CaltechAUTHORS:20160505-101053328
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66679
Deposited By: Ruth Sustaita
Deposited On:06 May 2016 19:06
Last Modified:28 Oct 2019 23:55

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