AAS 206th Meeting, 29 May - 2 June 2005
Session 14 Astrophysics with Optical Interferometry
Poster, Monday, 9:20am-6:30pm, Tuesday, 10:00am-7:00pm, May 30, 2005, Ballroom A

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[14.19] A Preliminary Physical Orbit for HD 98800 B

A. F. Boden (MSC/Caltech), A. I. Sargent (Caltech), R. L. Akeson (MSC/Caltech), J. M. Carpenter (Caltech), G. Torres, D. W. Latham (Harvard-Smithsonian CfA), D. R. Soderblom, E. Nelan (STScI)

As a part of a larger program to measure physical properties of PMS binary systems, we have observed the quadruple system HD 98800 with the Keck Interferometer (KI), and resolved the two separate spectroscopic binary components of the system. In particular we have observed the North (B) binary component on multiple epochs, and integrating our data with the double-lined spectroscopic orbit from Torres et al 1995 has allowed us to estimate a provisional physical orbit for the B system. This orbit in turn yields relatively accurate (5 independent system distance and component luminosity estimates. Our orbital solution favors a high-inclination orientation for the orbit, suggesting that both components of the HD 98800 B system are under 0.6 Msolar. Comparisons between the estimated physical parameters for the HD 98800 B components with mass-luminosity models of PMS stars will be discussed.

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© 2005. The American Astronomical Soceity.