NOAO > Observing Info > Approved Programs > 2001A-0275
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NOAO > Observing Info > Approved Programs > 2001A-0275 |
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PI: Tom Williams, University of New Mexico, tw@as.unm.edu
Address: 800 Yale Ave, Albuquerque, NM 87131, USA
Title: Radial Velocity Variables in the PG Survey He-rich Hot Subdwarf O Stars
Abstract:
The evolutionary status of the ``compact'' He-rich hot subdwarf O
stars remains in limbo. Although a variety of plausible theoretical
scenarios have been proposed to place the compact sdOs in a rational
evolutionary context, none are as yet solidly established. The very few
sdO masses that have been empirically determined do not meet with
theoretical expectations for compact sdOs. This project is intended to
identify the radial velocity variables in a sample of 25 sdO binary
candidates. The candidate systems have been identified on the basis of
either a near IR flux excess or an anomalous optical flux distribution.
Candidates showing significant radial velocity variability will be
subject to precision radial velocity studies to determine the orbital
parameters and masses of compact sdOs, thereby substantially
constraining their evolutionary history.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
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NOAO > Observing Info > Approved Programs > 2001A-0275 |
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