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

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

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..780b&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Astronomy and Astrophysics

Astronomy

Binary And Multiple Stars, Low Luminosity Stars, Subdwarfs, And Brown Dwarfs, Astrometric And Interferometric Instruments

Scientific paper

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 Msolar for the primary and 0.19230+/-0.00071 Msolar 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.

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