Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-04
Astronomy and Astrophysics
Astrophysics
4 pages, 6 figures, accepted for publication in A&A Letters
Scientific paper
We present results of the RXTE observations of an extremely intense X-ray burst detected from the source 4U1724-307 in the globular cluster Terzan 2. The burst profile was complex consisting of two precursors and a long primary peak. During the first (strong) precursor the source luminosity, L ~ 3.6 x 10^38 erg/s, was comparable with that measured in the main event. The structure of the profile, its dependence on energy and observed spectral evolution indicated strong photospheric expansion of a neutron star. The effective temperature and radius of the photosphere were estimated from the black body model at different stages of expansion, their correlations and specific features of the profile were analyzed and discussed.
Grebenev Sergei A.
Lutovinov Alexander A.
Molkov S. V.
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