Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..661t&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 661-663 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
4
Spectrum Analysis, Supergiant Stars, X Ray Astronomy, X Ray Binaries, X Ray Spectra, Emission Spectra, Light Curve, Spectral Resolution, Stellar Evolution, Stellar Flares, Stellar Spectra
Scientific paper
Results from Ginga show that the unidentified X ray source 3A1954+319 may be a supergiant binary system. Its light curve is dominated by flaring on timescales of several minutes, with variations in intensity up to a factor ten. There are rapid changes in the spectral hardness. The X ray spectrum above 4 keV can be modeled as a power law with a high energy cutoff, but below approx. 4 keV there is a soft excess, suggesting a cold adsorption column modified by partial covering. The observed spectral variations appear to be due to changes in both the shape of the continuum and the adsorption column. The X ray properties of 3A1954+319 indicate that it is a supergiant binary system and the lack of an optical counterpart means that this classification is somewhat tentative.
Remillard Ron
Tweedy Richard W.
Warwick Robert S.
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