Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..755m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 755-761.
Astronomy and Astrophysics
Astronomy
12
Pulsars, Spaceborne Astronomy, Stellar Mass Accretion, Stellar Oscillations, Stellar Spectrophotometry, X Ray Binaries, Exosat Satellite, Heao 2, Spectral Energy Distribution, Spectrum Analysis, Stellar Structure
Scientific paper
Results are presented of several Einstein and Exosat X-ray observations of 4U 1145 - 619, an X-ray pulsar orbiting the Be star HD 102567/Hen 715 with marked transient behavior. Pulse-timing analysis of data from imaging instruments on both missions was performed using a period-folding technique, which showed an interesting variation of the light curve shape. During observations at periastron, where the source was predictably brighter, a strong variability was observed on the time scale of several thousand seconds. The global X-ray picture presented can be interpreted in the context of an eccentric binary system with variable accretion, but especially the low-energy Exosat channel multiplier array pulsed light curve raises new questions on the detailed accretion geometry.
Bignami Giovanni F.
Caraveo Patricia A.
Goldwurm Andréa
Mereghetti Sandro
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