RX J0515.6+0105: an unusual, eclipsing, magnetic cataclysmic variable

Details RX J0515.6+0105: an unusual, eclipsing, magnetic cataclysmic variable RX J0515.6+0105: an unusual, eclipsing, magnetic cataclysmic variable

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...443..319s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 443, no. 1, p. 319-328

Astronomy and Astrophysics

Astrophysics

31

Cataclysmic Variables, Eclipsing Binary Stars, Magnetic Stars, X Ray Stars, Cyclotron Radiation, Ephemeris Time, Light Curve, Radial Velocity, Rosat Mission, Visual Photometry, White Dwarf Stars

Scientific paper

We report multiwavelength observations of the optical counterpart of the ROSAT X-ray source RX J0515.6+0105. Optical photometric data spanning approximately 1 yr reveal eclipse features that are deep, total, and variable in profile. The eclipse timings give an orbital ephemeris of JDsolar orbit = 2449087.8173(3)+0.3326120(7) E, with considerable phase jitter caused by the variable eclipse profiles. The system is characterized by a soft thermal spectrum (k Tbb is approximately = 33 eV) strong He II lambda 4686 emission, large-amplitude radial velocity variations consistent with emission from an accretion stream, and, most significantly, significant circular polarization. Taken together, these characteristics strongly suggest that RX J0515.6+0105 is a magnetic cataclysmic variable, most likely an AM Herculis system in which the accretion column/stream is eclipsed. However, the possibility that the white dwarf rotates asynchronously, and that RX J0515.6+0105 is a DQ Her system, has not yet been ruled out unequivocally. Observations obtained during eclipse reveal the secondary star to be a slightly evolved M0-M1 dwarf, and allow us to place a lower limit on the distance of RX J0515.6+0105 of approximately 500 pc.

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