Multimission observations of 4U 1538 - 52

Details Multimission observations of 4U 1538 - 52 Multimission observations of 4U 1538 - 52

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370..670c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 370, April 1, 1991, p. 670-676. Research supported by Sonoma State Universi

Astronomy and Astrophysics

Astronomy

11

Eclipsing Binary Stars, Pulsars, X Ray Binaries, Heao, Spaceborne Astronomy, X Ray Astronomy

Scientific paper

Archival data from the eclipsing binary X-ray pulsar 4U 1538 - 52 have been analyzed. These data were obtained from four different X-ray missions and span a baseline of 12 yr. Scanning observations were made using the Uhuru satellite during May 9-15, 1972 and using HEAO A1 during August 26-31, 1977 and February 22-28, 1978. Pointed observations were made using the Einstein Observatory during March 2, 1979 and Exosat during March 17, August 7-8 and 10-11, 1984. These data are used to improve the orbital period determination, to set a limit to the change in orbital period, and to improve the knowledge of the pulse period as a function of time. Exosat pulse profiles are presented and pulse-phase spectroscopy is performed. The pulsation observations of 4U 1538 - 52 are modeled geometrically, and parameters for magnetic beaming of the accretion column are derived.

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