Transition in the X-ray light curve of the AM Herculius system V834 Centauri (E1405-451): 1985-1986 EXOSAT observations

Details Transition in the X-ray light curve of the AM Herculius system V834 Centauri (E1405-451): 1985-1986 EXOSAT observations Transition in the X-ray light curve of the AM Herculius system V834 Centauri (E1405-451): 1985-1986 EXOSAT observations

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..947s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 2, p. 947-954

Astronomy and Astrophysics

Astronomy

5

Binary Stars, Iron, Light Curve, Spectrum Analysis, Ultraviolet Astronomy, Ultraviolet Spectra, X Ray Astronomy, X Ray Imagery, Black Body Radiation, Bremsstrahlung, Density (Mass/Volume), Exosat Satellite, Heao 1, Heao 2, Iue, Optical Polarization

Scientific paper

We analyze the EXOSAT observations of the AM Herculis system V834 Centauri (E1405-451), taken in 1985 March and 1986 August. Archival UV data, simultaneous with the 1986 observations, are also considered. The soft X-ray light curve has a double humped structure, with total eclipse at phi approximately 0.0. It differs significantly from that observed with EXOSAT in 1984. The soft X-ray emission can be described as a black-body of temperature around 10-30 eV, with column density consistent with the interstellar values (5 x 1019- 1.0 x 1020/sq cm). The hard X-ray emission is nearly sinusoidally modulated with a dip at phi approximately 0.0. This component is consistent with thermal bremsstrahlung emission, with rather high column densities (approximately 1022/sq cm. There is indication for absorption variable with orbital phase. At both epochs, evidence for an iron emission feature at approximately 7 keV and with high equivalent widths (approximately 0.8-2 keV) is found. The results are discussed in terms of a scenario of the source suggested by the optical and polarization light curves.

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