The X-ray source SLX 1732-304 in the globular cluster Terzan 1: The spectral states and an X-ray burst |
| |
| Authors: | M N Pavlinsky S A Grebenev A A Lutovinov R A Sunyaev A V Finoguenov |
| |
| Institution: | (1) Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117810, Russia;(2) Max-Planck-Institut fuer Astrophysik, Karl Schwarzschild Strasse 1, 86740 Garching bei Muenchen, Germany |
| |
| Abstract: | ART-P/Granat observations of the X-ray burster SLX 1732-304 in the globular cluster Terzan 1 are presented. The X-ray (3–20 keV) fluxes from the source differed by more than a factor of 4 during the observing sessions on September 8 (F x ? 6.95 × 10?10 erg cm?2 s?1) and October 6, 1990 (F x ? 1.64 × 10?10 erg cm?2 s?1). The intensity variations of SLX 1732-304 were apparently accompanied by variations in its hardness: whereas the source in its high state had the spectrum with a distinct exponential cutoff typical of bright low-mass X-ray binaries, its low-state spectrum could be satisfactorily described by a simple power law with a photon index α?1.7. During the ART-P observation on September 8, a type I X-ray burst was detected from SLX 1732-304. |
| |
| Keywords: | neutron stars bursters X-ray sources X-ray bursts globular clusters |
| 本文献已被 SpringerLink 等数据库收录！ |
|
