Asymmetric Mass Accretion in the Magnetic Cataclysmic Variable RE1149+28

S.B. Howell, M. Sirk, R.F. Malina

The Astrophysical Journal, 439, p991-995, 1995.

Abstract

We present the first detailed extreme ultraviolet photometric observations of a magnetic cataclysmic variable. Our two EUVE observations of the AM Her star RE1149+28 were obtained about one year apart and show lightcurve variations on orbital to yearly timescales, as well as long-term mean flux level changes of a factor of two. The photometric data show a persistent ingress EUV enhancement which lasts ~0.04 in phase. We attribute this to a region of ~1e3 km in extent at the accretion impact site, on or very near the surface of the white dwarf primary. Our observations of RE1149 are consistent with a relatively low system inclination and provide a best fit orbital period of 90.14 +/- 0.015 minutes.

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