GINGA observation of an AM Herculis type source H0538 + 608

Details GINGA observation of an AM Herculis type source H0538 + 608 GINGA observation of an AM Herculis type source H0538 + 608

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367..270i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. 270-277.

Astronomy and Astrophysics

Astrophysics

32

Cataclysmic Variables, Ginga Satellite, Satellite Observation, Stellar Mass Accretion, White Dwarf Stars, X Ray Binaries, Mass Flow, Stellar Flares, Stellar Luminosity, Stellar Rotation, Stellar Temperature

Scientific paper

Results from a Ginga observation of the AM Her type object H0538 + 608 are presented. During the first half of the observation (pulsing state) the source showed periodic modulations caused by the white dwarf rotation, and the modulation profile was characterized by a flat top and a flat bottom. During the second half, the source was in a remarkable flaring state and the periodic modulation disappeared. The dramatic change of the X-ray light curve is interpreted in terms of a change of accretion pattern between an eclipsing spot and a noneclipsing spot. The spectrum is well described throughout by a thin thermal model including an iron K-line with equivalent width of some hundred eV, supporting the standard model for the hard X-ray emission region. The temperature in the pulsing state was found to change with the spin phase of the white dwarf. In the flaring state, the temperature showed a positive correlation with the source luminosity.

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