Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.1105m&link_type=abstract
American Astronomical Society, HEAD meeting #12, #11.05
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an analysis of the highly variable X-ray source 3A 1954+319 from 2005 to 2009. We focus on an outburst serendipitously observed during INTEGRAL Key Program observations of the Cygnus region in November 2008 and on the Swift-BAT longterm light curve. The source has been identified to be one of only eight known symbiotic X-ray binaries, systems composed of an accreting neutron star orbiting in a highly inhomogeneous medium around an M-giant companion. Its 3-80 keV spectrum can be described by a broken power law model. The extremely long pulse period of 5.3 hours is clearly visible in the INTEGRAL-ISGRI light curve and confirmed by an epoch folding period search. Furthermore, these light curves allow for the determination of a very strong spin-up of -2 x 10-4 d/d during the 2008 outburst. This is confirmed by the pulse period evolution calculated from Swift-BAT data. Based on these results we discuss a possible wind accretion scenario for this source. In addition, we present a preliminary analysis of high quality data of the soft spectral component of 3A 1954+319 obtained with Chandra and RXTE in 2010/2011 during a relatively stable phase of moderate source brightness, allowing us to further constrain properties of the X-ray source as well as the M-star wind.
Cadolle Bel Marion
Corbert H. D. R.
Fuerst Felix
Grieves N.
Grinberg Victoria
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