Physics – Optics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542925s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #429.25; Bulletin of the American Astronomical Society, Vol. 42, p.354
Physics
Optics
Scientific paper
Elias 12 (V807 Tau) is a pre-main-sequence triple system in the Taurus star forming region. We have been mapping the orbital motion of the components using adaptive optics imaging at the Keck Observatory and previously, with the Fine Guidance Sensors on board the Hubble Space Telescope. Our measurements of the close pair, Elias 12 Na-Nb, now cover nearly a complete orbital period and we present the parameters from the orbital fit. We also measure the center of mass motion of the close pair relative to the wide component, Elias 12S, yielding the mass ratio in addition to the total system mass. Combined with a parallax measured using VLBA radio interferometry, we can determine precise masses for the components in the system. We also present high resolution spectroscopy showing the rotational properties of the northern and southern sources. Results from this program will provide key empirical data for testing pre-main-sequence theoretical models, determining binary formation mechanisms, and investigating the dynamical evolution of young multiple systems.
Prato Lisa
Schaefer Gail
Simon Manfred
Zavala Robert T.
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