High energy X ray observations of GX 1+4 with HEXE

Details High energy X ray observations of GX 1+4 with HEXE High energy X ray observations of GX 1+4 with HEXE

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..541m&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 541-544 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astrophysics

3

Energy Spectra, Spaceborne Experiments, Stellar Luminosity, X Ray Astronomy, X Ray Binaries, Bremsstrahlung, Mir Space Station, Pulsars, Pulse Duration, Spaceborne Astronomy, Time Measurement, X Ray Astrophysics Facility

Scientific paper

Two observations with the High Energy X ray Experiment (HEXE) on board the Soviet Kvant module and performed on the X ray pulsar GX 1+4(4U1728-24) are reported. During the first observation on Oct. 31, 1987 the luminosity in the energy range 20 to 60 keV was 2 x 10 37 erg/sec. For the second observation, lasting from 23 to 27 Sep. 1988 there is no reliable aspect information available. The phase averaged spectra of both observations are well fitted by a thermal bremsstrahlung. A comparison to spectra, gained during the high state of GX 1+4, shows that the spectrum is now significantly harder. The timing analysis using an epoch folding method allowed obtaining of pulsational periods. The pulse periods fit well together with periods determined by Ginga, defining a long term spin down of GX 1+4.

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