Observations of the X-ray source 4U1700-377/HD 153919 in the energy range 35-1300 KeV with the Sigma telescope on board the GRANAT observatory

Details Observations of the X-ray source 4U1700-377/HD 153919 in the energy range 35-1300 KeV with the Sigma telescope on board the GRANAT observatory Observations of the X-ray source 4U1700-377/HD 153919 in the energy range 35-1300 KeV with the Sigma telescope on board the GRANAT observatory

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993astl...19..188s&link_type=abstract

Astronomy Letters, Vol. 19, p. 188-194; Pis'ma v Astronomicheskij Zhurnal (ISSN 0320-0108), vol. 19, no. 6, p. 483-499. In Russ

Astronomy and Astrophysics

Astronomy

4

Light Curve, Stellar Luminosity, Stellar Spectra, Variable Stars, X Ray Sources, Neutron Stars, Spaceborne Telescopes, X Ray Astronomy, X Ray Telescopes

Scientific paper

In 1990-92, the X-ray source 4U1700-377 was within the field of view of the Sigma telescope during 15 sessions of observations. On September 12, 1990, strong variability of the source was observed in hard X-rays. During the strongest burst, flux from the source increased by about 10 times on a time scale of about 6000 s. On September 27, 1990, variations of the hard X-ray flux were observed with a quasi-period of 5.4 hr. In all other observations, this periodicity was not detected. Approximation of the spectrum with a thermal bremsstrahlung model yields a temperature (characterizing hardness of the spectrum) of about 45 KeV. No variations of the spectrum shape were detected while the source luminosity changed more than an order of magnitude.

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