A New Low-Mass, Pre-Main Sequence Eclipsing Binary in Orion:Precise Mass Determinations of System Components

Details A New Low-Mass, Pre-Main Sequence Eclipsing Binary in Orion:Precise Mass Determinations of System Components A New Low-Mass, Pre-Main Sequence Eclipsing Binary in Orion:Precise Mass Determinations of System Components

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3020c&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #30.20; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a double-lined orbit solution for a new low-mass eclipsing binary system in the Orion star-forming region. Our observations include radial velocities derived from optical high-resolution spectroscopy. The orbit solution presented here permits the determination of precise empirical masses for both components of the system. There is strong evidence that this system is a member of the Orion Nebula Cluster, and therefore has an age of only a few million years. The system exhibits both strong Li and a center-of-mass velocity consistent with cluster membership. This newly discovered system is thus of particular interest because it includes two low-mass stars which will provide useful constraints for testing the predictions of current theoretical models of pre-main sequence stellar evolution. There is also strong evidence in our data for a wide tertiary component of the system with a period of ˜20 yrs, but its presence does not significantly affect the precision of the mass determinations.

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