Identification of two southern X-ray emitting cataclysmic variables

Details Identification of two southern X-ray emitting cataclysmic variables Identification of two southern X-ray emitting cataclysmic variables

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..275t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 1, 1986, p. 275-298. Research supported by the Australian Departm

Astronomy and Astrophysics

Astrophysics

41

Cataclysmic Variables, Stellar Radiation, X Ray Stars, Astronomical Photometry, Astronomical Spectroscopy, Exosat Satellite, Time Series Analysis, X Ray Imagery, X Ray Spectra

Scientific paper

The optical identification of two faint HEAO 1 X-ray sources with previously uncataloged cataclysmic variables is reported. The two cataclysmic variables, 1H 0542 - 407 and H0534 - 581, have average V magnitudes of about 15.7 and about 14.9, and have similar high excitation spectra with moderate to strong He II 4686 A emission. X-ray measurements and multicolor optical photometry for both objects establish 1H 0542 - 407 as a new DQ Herculis magnetic variable having a white dwarf rotation period of about 1920 s and an orbital period near 6.2 hr. 1H 0542 - 407 is unusual among DQ Her systems in having a large soft X-ray pulse fraction of about 70 percent semiamplitude below 1 keV. No definitive X-ray or optical periodicities were detected from H0534 - 581, but it appears to be either a nova-like variable or a DQ Her system. Both cataclysmic variables have very hard X-ray spectra, with evidence for iron line emission at about 6.7 keV from 1H 0542 - 407.

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