1E 1048.5 + 5421 - A new 114 minute AM Herculis binary

Details 1E 1048.5 + 5421 - A new 114 minute AM Herculis binary 1E 1048.5 + 5421 - A new 114 minute AM Herculis binary

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.

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