The X-ray absorption spectrum of VELA X-1

Details The X-ray absorption spectrum of VELA X-1 The X-ray absorption spectrum of VELA X-1

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..225h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 225-234.

Astronomy and Astrophysics

Astrophysics

45

Absorption Spectra, Eclipsing Binary Stars, Stellar Spectra, Supergiant Stars, X Ray Binaries, X Ray Spectra, Accretion Disks, Exosat Satellite, Heao 2, Neutron Stars, Stellar Luminosity

Scientific paper

Exosat observations of the massive X-ray binary Vela X-1 are spectrally analyzed. The absorbing column density shows erratic factor of 10 increases up to 5 x 10 to the 23rd H/sq cm that can occur at any orbital phase and last from minutes to many hours. These variations occur on top of a base level of absorption that increases from 3 x 10 to the 22nd H/sq cm to 15 x 10 to the 22nd H/sq cm from orbital phase about 0.2 to 0.85. It is suggested that these changes are due to intermittent formation of a tenuous accretion disk around the neutron star. The X-ray spectra show a low-energy excess above that expected from cold photoelectric absorption. The character of this excess depends on orbital phase and two different modifications to the simple absorption model are required.

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