Volume 427, Number 1, November III 2004
|Page(s)||293 - 298|
|Section||Stellar structure and evolution|
|Published online||25 October 2004|
INTEGRAL observations of the peculiar BeX System SAX J2103.5+4545
Institut de Ciència dels Materials, Universitat de València, 46071 Paterna-Valencia, Spain e-mail: email@example.com
Accepted: 21 July 2004
We present an INTEGRAL data analysis of the X-ray transient SAX J2103.5+4545 during two outbursts detected in December 2002. The INTEGRAL coordinates and error circle agree with the position of the recently proposed optical counterpart. A power-law plus cut-off model provided a good fit to the 4–150 keV spectrum yielding a photon index of , a cut-off energy keV and a folding energy keV. The X-ray luminosity in the 4-150 keV energy range was found to be erg s-1, assuming a distance of 6.5 kpc. This luminosity, together with the derived photon index, indicate that the source is in a bright state. A second pulse period is measured. This value is significantly smaller than previous measurements, indicating a long-term spin-up episode.
Key words: accretion, accretion disks / binaries: close / stars: emission-line, Be / stars: pulsars: individuals: SAX J2103.5+4545 / X-rays: binaries / stars: binaries: close
© ESO, 2004
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