Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..369c&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 369-374 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
1
Pulsars, Pulse Duration, Pulsed Radiation, Stellar Rotation, Stellar Spectra, X Ray Binaries, X Ray Spectra, Angular Momentum, Exosat Satellite, Periodic Variations, Pulse Rate, Spin Dynamics, Time Measurement
Scientific paper
The medium energy experiment onboard the EXOSAT satellite observed the X-ray binary system 4U 1538-52 on four occasions during March and August 1984. Observed pulsation periods indicate that the neutron star in the 4U 1538-52 system continued to spin down with P rate/P = 0.00023/yr in the period 1976 to 1988. The eclipse transition time of approximately 0.06 days gives a height of 1.5 times 10 to the 11th power cm for the atmosphere of the optical counterpart. The phase-average X-ray spectrum shows an iron line. The spectral form shows variations with pulse-phase.
Cusumano Giancarlo
dal Fiume Daniele
Frontera Filippo
Orlandini Mauro
Robba Natale Renato
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