Hard X ray pulses from VELA X-1

Details Hard X ray pulses from VELA X-1 Hard X ray pulses from VELA X-1

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..467k&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 467-471 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

2

Cyclotron Radiation, Pulsars, Spectrum Analysis, Stellar Flares, Stellar Spectra, X Ray Binaries, X Ray Spectra, Line Spectra, Mir Space Station, Spectral Resolution

Scientific paper

The high mass X-ray binary Vela X-1 (4U 0900-40) was observed with the high energy X-ray experiment on board the Kvant module in Nov. 1988 and Feb. 1989 for a total of 8 hours. Individual pulses during an active state were observed up to 70 KeV. The time averaged spectra for four binary phases were fitted with a power law plus exponential cutoff. During the flare state at binary phase 0.16 the spectrum is slightly softer. In all but the flare observation a significant excess flux between 70 and 96 KeV is observed. The spectral feature can be fitted with an emission line around 85 KeV, possibly a cyclotron line. The observed width is consistent with the energy resolution of the detector.

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