NDLI: The 5 hour pulse period and broadband spectrum of the symbiotic x-ray binary 3a 1954+319

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The 5 hour pulse period and broadband spectrum of the symbiotic x-ray binary 3a 1954+319

Content Provider	NASA Technical Reports Server (NTRS)
Author	Marcu, Diana M. Postnov, Konstantin A. Markwardt, Craig B. Corbet, Robin H. D. Pottschmidt, Katja Cadolle Bel, Marion Fuerst, Felix Miller, Sebstian Grinberg, Victoria Wilms, Joern
Copyright Year	2011
Description	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 approximately 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(exp -4) h h(exp -1) occurred. Between 2005 and 2008 a long term spin-down trend of 2.1 x 10(exp -5) h h(exp -1) was observed for the first time for this source. The 3-80 keV 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 accretion model for symbiotic X-ray binaries.
File Size	648707
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20110023035
Archival Resource Key	ark:/13960/t5m956p3n
Language	English
Publisher Date	2011-01-01
Access Restriction	Open
Subject Keyword	Astronomy Mass Broadband X Ray Binaries Energy Spectra Annual Variations Light Curve Symbiotic Stars Time Variable Stars Data Reduction X Ray Sources Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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