The Symbiotic X-ray Binary 3A 1954+319

Details The Symbiotic X-ray Binary 3A 1954+319 The Symbiotic X-ray Binary 3A 1954+319

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4209m&link_type=abstract

American Astronomical Society, HEAD meeting #11, #42.09; Bulletin of the American Astronomical Society, Vol. 41, p.726

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a timing and spectral analysis of the transient X-ray source 3A 1954+319, based on an outburst serendipitously observed during INTEGRAL Key Program observations of the Cygnus region in fall 2008 and on the Swift-BAT longterm light curve. Due to its strong variability previous observations are sparse but the source has been identified to be one of only eight known symbiotic X-ray binaries, i.e., systems composed of a hot accreting neutron star orbiting in a highly inhomogeneous medium around an M-giant companion. Its >20 keV spectrum can be described by a cutoff power law model. The extremely long pulse period of 5.3 hours is clearly visible in the INTEGRAL-ISGRI light curve and confirmed through an epoch folding period search. Furthermore, these light curves allow the determination of a very strong spin-up of -2 x 10-4 d/d. This is confirmed by the pulse period evolution calculated from Swift-BAT data.

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