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PG 0308 + 096 and PG 1026 + 002 - Two new short period binary stars resulting from common-envelope evolutionUltraviolet spectroscopy, optical spectroscopy, and spectrophotometry have been used to study the excess UV stars PG 0308 + 096 and PG 1026 + 002. Both objects are short-period binary systems, each containing a DA white dwarf star and a dM star. Orbital periods of approximately 0.284 day for PG 0308 + 096, and aproximately 0.597 day for PG 1026, have been found by spectroscopic analysis of the H-alpha emission line. Ly-alpha and Balmer line profile fitting were used to estimate the mass of white dwarf stars; mass estimates for the dM stars are based on their spectral types. The orbital inclinations are derived from these masses, the periods, and amplitudes of the H-alpha radial velocity curves. The equivalent width of the H-alpha emission line, in each binary system, varies with the orbital phase in such a manner as to imply that it arises, in large part at least, from the hemisphere of the M star that faces the white dwarf star.
Document ID
19930051131
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Saffer, Rex A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wade, Richard A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Liebert, James (Steward Observatory Tucson, AZ, United States)
Green, Richard F. (National Optical Observatories Tucson, AZ, United States)
Sion, Edward M. (Villanova Univ. PA, United States)
Bechtold, J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Foss, Diana (Steward Observatory Tucson, AZ, United States)
Kidder, K. (Arizona Univ. Tucson, United States)
Date Acquired
August 16, 2013
Publication Date
May 1, 1993
Publication Information
Publication: Astronomical Journal
Volume: 105
Issue: 5
ISSN: 0004-6256
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF AST-91-45162
CONTRACT_GRANT: NSF AST-88-18069
CONTRACT_GRANT: NAG5-343
CONTRACT_GRANT: NSF AST-85-14778
Distribution Limits
Public
Copyright
Other