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Title: Spectral evolution of GRS 1915+105 during the regular flares
Authors: Paul, Biswajit
Rao, A.R.
Keywords: Galactic center
circumnuclear matter
X-ray binaries
Issue Date: Dec-2001
Publisher: American Institute of Physics
Citation: AIP Conference Proceedings Vol.599, 2001, p846-849
Abstract: We have investigated spectral evolution of GRS 1915+105 during the regular flares by high time resolution spectroscopy. Twenty-four color light-curves were converted into 1 s and 3 s spectra. A spectral model consisting of a disk black-body and a power-law, shows that the flux variations during the regular flares (in 2-20 keV range) can mainly be attributed to changes in the disk black-body emission, with a small increase in the power-law flux. The disk black-body temperature increases gradually with the flux, and is associated with a decrease in the size of the emission region. Two different types of intensity variations, that is spectral-state transitions and regular flares involving a disappearing disk are found to occur simultaneously.
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Copyright: 2001 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Appears in Collections:Research Papers (A&A)

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