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The 5 hour pulse period and broadband spectrum of the Symbiotic X-ray Binary 3 A 1954 + 319
| Content Provider | Semantic Scholar |
|---|---|
| Author | Marcu, Diana M. Furst, Felix S. Pottschmidt, Katja Grinberg, Victoria Muller, Sebstian Wilms Postnov, Konstantin A. Corbet, Robin H. D. Markwardt Craig B. Marión |
| Copyright Year | 2011 |
| Abstract | We present an analysis of the highly variable accreting X-ray pulsar 3A 1954+319 using 2005-2009 monitoring data obtained with INTEGRAL and Swift. This considerably extends the pulse period history and covers flaring episodes in 2005 and 2008. In 2006 the source was identified as one of only a few known symbiotic X-ray binaries, Le" systems composed of a neutron star accreting from the inhomogeneous medium around an M-giant star. The extremely long pulse period of ~5.3 h is directly visible in the 2008 INTEGRAL-ISGRI outburst light curve. The pulse profile is double peaked and not significantly energy dependent. During the outburst a strong spin-up of -1.8 x 10-4 h hI occurred. Between 2005 and 2008 a long term spin-down trend of 2.1 x 10-5 h h -I was observed for the first time for this source. The 3-80 ke V pulse peak spectrum of 3A 1954+319 during the 2008 flare could be well described by a thermal Comptonization model. We interpret the results within the framework of a recently developed quasi-spherical accrection model for symbiotic X-ray binaries. Subject headings: binaries: symbiotic stars: individual (3A 1954+319) stars: neutron X-rays: binaries 1 NASA Goddard Space Flight Center, Astrophysics Science Division, Code 661, Greenbelt, MD 20771, USA 2CRESST & University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA 3 Dr, Karl Remeis-Observatory & ECAP, University of Erlangen-Nuremberg, Sternwartstr, 7, 96049 Bamberg, Germany 4Sternberg Astronomical Institute, 119992, Moscow, Russia 5NASA Goddard Space Flight Center, Astrophysics Science Division, Code 662, Greenbelt, MD 20771, USA 6European Space Agency, European Space Astronomy Centre P.O, Box 78, 28691, Villanueva de la Canada, 28692, Madrid, Spain https://ntrs.nasa.gov/search.jsp?R=20110023035 2019-06-10T23:08:19+00:00Z |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20110023035.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
