GINGA observation of an AM Herculis type source H0538 + 608

Abstract

view Abstract Citations (39) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS GINGA Observation of an AM Herculis Type Source H0538+608 Ishida, M. ; Silber, A. ; Bradt, H. V. ; Remillard, R. A. ; Makishima, K. ; Ohashi, T. Abstract 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. Publication: The Astrophysical Journal Pub Date: January 1991 DOI: 10.1086/169625 Bibcode: 1991ApJ...367..270I Keywords: 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; Astrophysics; STARS: ACCRETION; STARS: INDIVIDUAL ALPHANUMERIC: H0538; 608; STARS: WHITE DWARFS; X-RAYS: BINARIES full text sources ADS | data products SIMBAD (3)