Extreme Ultraviolet Explorer observations of the magnetic cataclysmic variable RE 1938-461

Details Extreme Ultraviolet Explorer observations of the magnetic cataclysmic variable RE 1938-461 Extreme Ultraviolet Explorer observations of the magnetic cataclysmic variable RE 1938-461

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l..69w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 2, p. L69-L72.

Astronomy and Astrophysics

Astronomy

16

Cataclysmic Variables, Extreme Ultraviolet Explorer Satellite, Magnetic Stars, White Dwarf Stars, Astronomical Satellites, Light Curve, Sky Surveys (Astronomy), Stellar Luminosity, Stellar Magnetic Fields, Stellar Mass Accretion

Scientific paper

The magnetic cataclysmic variable RE 1938-461 was observed by the Extreme Ultraviolet Explorer (EUVE) Deep Survey instrument on 1992 July 8-9 during in-orbit calibration. It was detected in the Lexan/ boron (65-190 A) band, with a quiescent count rate of 0.0062 +/- 0.0017/s, and was not detected in the aluminum/carbon (160-360 A) band. The Lexan/boron count rate is lower than the corresponding ROSAT wide-field camera Lexan/boron count rate. This is consistent with the fact that the source was in a low state during an optical observation performed just after the EUVE observation, whereas it was in an optical high state during the ROSAT observation. The quiescent count rates are consistent with a virtual cessation of accretion. Two transient events lasting about 1 hr occurred during the Lexan/boron pointing, the second at a count rate of 0.050 +/- 0.006/s. This appears to be the first detection of an EUV transient during the low state of a magnetic cataclysmic variable. We propose two possible explanations for the transient events.

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