EXOSAT medium energy observations of binary X ray pulsar 4U1538-52

Details EXOSAT medium energy observations of binary X ray pulsar 4U1538-52 EXOSAT medium energy observations of binary X ray pulsar 4U1538-52

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..697z&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 697-699 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

Cycles, Pulsars, Pulse Duration, Pulsed Radiation, X Ray Binaries, Angular Momentum, Exosat Satellite, Spectrum Analysis, Spin, Stellar Orbits, Stellar Spectra, Stellar Winds

Scientific paper

The binary X ray pulsar 4U1538-52 was observed from EXOSAT in 1984. The data on 17 Mar. and 10 Aug. is analyzed and discussed. The pulsation periods, 529.9 s and 530.1 s respectively, are longer than that measured in 1983. The instantaneous period rate is about 15 times larger then average spin down rate. The results suggest that 4U1538-52 is a wind-fed pulsar, and its pulsation period changes in random walk manner in response to fluctuations in the external torque, similar to the case of Vela X-1.

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