Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178..513w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 178, Mar. 1977, p. 513-524. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
55
Binary Stars, Light Curve, Satellite Observation, Sky Surveys (Astronomy), Stellar Luminosity, X Ray Stars, Ariel 5 Satellite, Eclipses, Stellar Mass Accretion, Stellar Winds
Scientific paper
Results are reported for observations of 3U 0900-40 (Vel X-1) by the Ariel V Sky Survey Instrument during some 900 separate satellite orbits over a 17-month period. A least-squares fit to data on the time of the eclipse centers yields a period of 8.964 days with an eclipse-center epoch at phase zero approximately equal to MJD 42620.30. A minimum eclipse duration of about 1.69 days is determined along with a maximum X-ray luminosity in eclipse of approximately 6 by 10 to the 34th power erg/s. Some peculiar characteristics of the X-ray light curve are discussed, and it is concluded that most of the features observed in that light curve can be explained qualitatively in terms of stellar-wind accretion combined with associated shock regions, accretion wakes, and major disturbances due to both material driven off the accretion disk by radiation pressure and material accreted from Roche-lobe overflow near periastron.
Griffiths Richard E.
Watson Michael G.
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