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Circular polarimetry of EXO 033319-2554.2 - A new eclipsing AM Herculis starThis Letter presents circular polarimetry that unequivocally identifies EXO 033319-2554.2 as only the third eclipsing AM Her star and brings the total number of AM Her stars now identified to 14. The orbital period is 126.4 minutes, as previously reported, and defines a new short-period edge to the period gap seen in all classes of cataclysmic variable stars. EXO 033319-2554.2 shows 2.5 mag deep eclipses of the predominantly accreting magnetic pole on the white dwarf. Before the eclipse, the pole rotates into the line of sight and shows white-light circular polarization, due to cyclotron radiation, that reaches values as high as 10 percent. There is some evidence that the second pole is emitting cyclotron radiation too. How high time resolution photometry, linear polarimetry, and spectroscopy will be of great value in understanding this system.
Document ID
19880054409
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Berriman, Graham
(Arizona Univ. Tucson, AZ, United States)
Smith, Paul S.
(Steward Observatory Tucson, AZ, United States)
Date Acquired
August 13, 2013
Publication Date
June 15, 1988
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 329
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
88A41636
Funding Number(s)
CONTRACT_GRANT: NSF AST-86-19296
CONTRACT_GRANT: NAS5-29293
Distribution Limits
Public
Copyright
Other

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