INTEGRAL Observations of the Vela Region Focusing on Vela X-1

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The Vela region has been observed for 1.7 Ms in November 2005 by the INTEGRAL satellite. We present preliminary spectral and temporal results of Vela X-1, an eclipsing neutron star hosted in a wind-accreting high-mass X-ray binary system. Using data from ISGRI, SPI and JEM-X, we firmly confirm the existence of cyclotron resonant scattering features (CRSF) at ~27 keV and ~54 keV, implying a neutron-star magnetic field of ~3 10^12 Gauss, and the presence of an iron emission line at ~6.5 keV. During two strong flares those parameters remained unchanged. Furthermore we measure the neutron-star spin period of 283.6 s, indicating a still constant trend.
4 pages, 11 figures. Accepted for publication in ESA SP-622 (Proceedings of the 6th INTEGRAL Workshop, Moscow, 2006 07 03-07)

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Astrophysics

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http://salesiana.dossiersoluciones.com/handle/123456789/122471

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/astro-ph/0701641
 http://arxiv.org/abs/astro-ph/0701641

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arXiv