Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..641m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 15, 1987, p. 641-652. SERC-NATO-supported research.
Astronomy and Astrophysics
Astrophysics
43
Astronomical Photometry, Binary Stars, X Ray Binaries, Emission Spectra, Light Curve, Optical Measurement, Polarimetry, Stellar Motions, White Dwarf Stars
Scientific paper
The discovery of a new AM Herculis binary system, found as a serendipitous Einstein X-ray source, is described. Like the previously discovered mass-transfer binaries involving synchronously rotating magnetic white-dwarf primaries, the system exhibits strong circular polarization, X-ray and optical continuum variations, and optical emission lines, all of which seem to be modulated with these binary periods of 114.5 + or - 0.2 minutes. Although all data are not concurrent, the new system appears to possess the highest ratio of F(x)/F(opt) yet found for an AM Her system. The surprising accumulation of AM Her variables with periods near 114 minute is commented on.
Gioia Isabella Maria
Liebert James
Maccacaro Tommaso
Morris Simon L.
Schmidt Gary D.
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