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Title:
H0538 + 608 (= BY Camelopardalis) - an asynchronously rotating AM Herculis binary?
Authors:
Silber, A.; Bradt, H. V.; Ishida, M.; Ohashi, T.; Remillard, R. A.
Affiliation:
AA(MIT, Cambridge, MA), AB(MIT, Cambridge, MA), AC(Tokyo, University, Japan), AD(Tokyo, University, Japan), AE(MIT, Cambridge, MA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 20, 1992, p. 704-713. Research supported by NASA. (ApJ Homepage)
Publication Date:
04/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ACCRETION DISKS, CATACLYSMIC VARIABLES, STELLAR MASS ACCRETION, STELLAR ROTATION, WHITE DWARF STARS, X RAY BINARIES, H ALPHA LINE, LIGHT CURVE, MONTE CARLO METHOD, STELLAR ORBITS, STELLAR SPECTROPHOTOMETRY
DOI:
10.1086/171243
Bibliographic Code:
1992ApJ...389..704S

Abstract

Evidence from a concurrent X-ray/optical observing program is presented which indicates that the orbital period of the anomalous AM Her-type cataclysmic variable H0538 + 608 (BY Cam) differs from the rotational period by 1.3 +/- 0.1 percent. This finding would explain much of the unusual behavior previously exhibited in optical photometry and polarimetry. The model proposed by Ishida et al. (1991) is developed further using observations of accretion and the primary characteristics of optical and X-ray light curves and radial velocity measures of H-alpha. An optical QPO with a period of about 30 min was seen on two nights and possible causes of it are discussed.

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