Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308..199p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 1, 1986, p. 199-212.
Astronomy and Astrophysics
Astrophysics
176
Eclipsing Binary Stars, Periodic Variations, X Ray Binaries, Abundance, Accretion Disks, Companion Stars, Interstellar Matter, Metallicity
Scientific paper
Using the EXOSAT Observatory the authors have discovered a new transient X-ray burst source EXO 0748-676 that shows 8.3 minute duration X-ray eclipses that recur with a period of 3.82 hr. If the companion star is on the main sequence, the eclipse duration gives a companion mass of 0.45 M_sun; and a system inclination of 75°. Irregular intensity dips that involve up to an 80% reduction in 2 - 10 keV intensity are observed at orbital phases between ≡0.8 - 0.2. The intensity dips are most likely due to obscuration of the central X-ray source by a thickened region at the outer edge of the accretion disk that is caused by its interaction with the inflowing gas stream.
Giommi Paolo
Gottwald Manfred
Parmar Arvind N.
White Nicholas E.
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