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[93.03] Discovery and Analysis of New Very Low-Mass Pre-Main-Sequence Eclipsing Binaries

K.G. Stassun, R.D. Mathieu (University of Wisconsin - Madison), L.P.R. Vaz (Universidade Federal de Minas Gerais, Brazil), N.S. Stroud (University of Wisconsin - Madison)

We present an update on our program to discover new, low-mass, pre-main-sequence (PMS) eclipsing stars, which we use to empirically test and calibrate PMS stellar evolutionary models.

We have completed our analyses of SM790, a double-lined spectroscopic, eclipsing binary in Orion. We derive component masses of 1.01 M_\odot and 0.73 M_\odot for the primary and secondary, respectively. The formal uncertainties on the masses are ~1%. We compare the empirically determined positions of these stars on the H-R diagram to those predicted from various PMS stellar evolutionary models.

If our scheduled Gemini program is successfully executed, we will also present our first spectroscopic observations of a newly discovered eclipsing binary system that promises to yield empirical stellar masses at or near the stellar/sub-stellar boundary.

The author(s) of this abstract have provided an email address for comments about the abstract: keivan@astro.wisc.edu

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.