Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0803s&link_type=abstract
American Astronomical Society Meeting 208, #8.03; Bulletin of the American Astronomical Society, Vol. 38, p.86
Astronomy and Astrophysics
Astronomy
Scientific paper
We present preliminary results from an ongoing program to discover and characterize pre-main-sequence (PMS) spectroscopic binaries (SBs) in the Orion Nebula Cluster (ONC). We have been spectroscopically monitoring 400 ONC stars with known rotation periods brighter than V of 16 with the Hydra north (WIYN 3.5m) and south (CTIO 4m) instruments over the past 6 years with as many as 10 epochs per target. We achieve radial-velocity precisions of 1-2 km/s for most objects. We have so far identified 30 SBs among 300 targets that have been observed multiple times, which implies an SB fraction of at least 10%. We show examples and preliminary orbit solutions of interesting cases. We consider whether the identified SBs are preferentially found in some region of rotation-period space, and find in particular that ultra-fast rotators (rotation periods of 1 day or less) do not appear to be tidally locked binaries. Ultimately, this ongoing study will address questions of close binary fractions and of orbital/rotational evolution at 1 Myr.
Mathieu Renaud
Stassun Keivan
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