NOAO >   Observing Info >   Approved Programs >   2002A-0075

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Proposal Information for 2002A-0075


PI: Tom Williams, University of New Mexico, tw@as.unm.edu
Address: 800 Yale Avenue SE, Albuquerque, NM 87131, USA

CoI: Todd Burdulis, University of New Mexico

Title: Radial Velocity Variables Among The PG Survey He-rich Hot Subdwarfs

Abstract: The evolutionary status of the ``compact'' He-rich hot subdwarfs 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 26 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 orbital parameters and masses.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2002A-0075

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