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The Ultrashort Period Dwarf Nova SW Ursae Majoris

Published online by Cambridge University Press:  12 April 2016

A.W. Shafter ,
J.A. Hill ,
E.L. Robinson ,
P. Szkody ,
J.R. Thorstensen  and
M.A. Wood
A.W. Shafter
Affiliation:
Dept. of Astronomy, University of Texas, Austin, TX, U.S.A.
J.A. Hill
Affiliation:
Dept. of Astronomy, University of Texas, Austin, TX, U.S.A.
E.L. Robinson
Affiliation:
Dept. of Astronomy, University of Texas, Austin, TX, U.S.A.
P. Szkody
Affiliation:
Dept. of Astronomy, University of Washington, Seattle, WA, U.S.A.
J.R. Thorstensen
Affiliation:
Dept. of Physics & Astronomy, Dartmouth College, Hanover, NH, U.S.A.
M.A. Wood
Affiliation:
Dept. of Astronomy, University of Texas, Austin, TX, U.S.A.

Abstract

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SW UMa is an unusual dwarf nova in several respects. Recent observations by Robinson et al. (1986) have established that SW UMa is an SU UMa system, while Shafter, Szkody, and Thorstensen (1986) have presented evidence suggesting that SW UMa may be a DQ Her system as well. If the DQ Her classification is confirmed then SW UMa will be the only system to have this dual classification. Finally, time resolved spectroscopy of SW UMa has revealed the presence of an S-wave component in the Ha emission which has an unexpected phasing relative to the line wings.

Type
II. Radio, IR and Optical Observations
Information
International Astronomical Union Colloquium , Volume 93: Cataclysmic Variables: Recent Multi-Frequency Observations and Theoretical Developments , 1987 , pp. 125 - 126
Copyright
Copyright © Reidel 1987

References

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Shafter, A.W. and Szkody, P. 1984, Ap. J., 276, 305.CrossRefGoogle Scholar
Shafter, A.W., Szkody, P., and Thorstensen, J.R. 1986, Ap. J., in press.Google Scholar
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