Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216l..15m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 216, Aug. 15, 1977, p. L15-L18.
Astronomy and Astrophysics
Astronomy
29
Companion Stars, Periodic Variations, Pulsars, X Ray Astronomy, B Stars, Circular Orbits, Early Stars, Sas-3, Stellar Motions
Scientific paper
Observations of GX 304-1 (3U 1258-61) performed with the SAS-3 satellite revealed regular X-ray pulsations with a period of 272 s. Average pulse profiles, derived from 7 days of observation, are presented in four energy intervals covering the range 1-19 keV. The pulses are basically characterized by a single broad peak, and the amount of modulation decreases rapidly with increasing energy. The pulse arrival times are analyzed for effects of possible orbital motion of the X-ray star, and significant constraints are placed on the orbital parameters. For example, if it is established that the companion is an early-type star of at least 5 solar masses, then the orbital period is likely to be greater than about 15 days. Three 100-s flares were observed during which the source intensity rose by a factor of 4 in approximately 10 s.
Li King-Fai
McClintock Jeff E.
Nugent J. J.
Rappaport Saul A.
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