arXiv subjects

M. N. Pavlinsky

Publications and source records attributed to M. N. Pavlinsky.

22 records · Page 2Linked to original sources

arXiv2001

X-ray Bursts from the Source A1742-294 in the Galactic-Center Region

We present results of observations of the X-ray burster A1742-294 near the Galactic center with the ART-P telescope onboard the Granat observatory. The shape of its persistent spectra was well described by the model of bremsstrahlung from optically thin plasma, and it had remained essentially unchanged over $\sim2.5$ years of observations. We show that the mean interval between X-ray bursts from the source is several times shorter than assumed previously, and that the burst profile itself depends on the flux during the burst. We analyze in detail the strong X-ray burst detected from this source on October 18, 1990, and trace the evolution of its luminosity and radiation temperature.

astro-ph↗

arXiv2001

The X-ray Source SLX 1732-304 in the Globular Cluster Terzan 1: The Spectral States and an X-ray Burst

The results of ART-P/Granat observations of the X-ray burster SLX1732-304 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 ($F_{\rm X}\simeq6.95\times10^{-10}$ erg cm$^{-2}$ s$^{-1}$) and October 6, 1990 ($F_{\rm X}\simeq1.64\times10^{-10}$ erg cm$^{-2}$ s$^{-1}$). The intensity variations of SLX1732-304 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 $α\simeq1.7$. During the ART-P observation on September 8, a type I X-ray burst was detected from SLX1732-304.

astro-ph↗

arXiv2000

X-Ray Bursters A1742-294 and SLX1744-299/300 Near the Galactic Center

We present a study of two X-ray bursters in the Galactic Center field with the ART-P telescope onboard GRANAT. During 1990-1992 approximately 100 X-ray bursts were detected from the Galactic Center field and most of them were identified with the two persistent sources, A1742-294 and SLX1744-299/300. The burst recurrence times were found to be ~2.4 and ~4.6 hours, respectively, which is significantly shorter them was previously thought. We calculated the mean and maximum fluxes during the bursts and investigated their time profiles. We found that the shape of A1742-294 bursts correlates with the burst peak flux. The spectral analysis was carried out for the strongest burst, detected from A1742-294 on Oct 18, 1990.

astro-ph↗

arXiv1999

GRANAT/ART-P observations of GX3+1: type I X-ray burst and persistent emission

We present results of observations of the known LMXB source GX3+1 with the telescope ART-P on board GRANAT in the fall of 1990. A strong X-ray burst was detected from the source on Oct. 14 when it was in the low X-ray state with a luminosity ~30% smaller than the normal one. That was only the second case for the whole history of its study when it exhibited such type of activity. We describe results of the source spectroscopy during the burst and persistent state and discuss formation of its X-ray emission in the accretion disk boundary layer. It is noted that scattering on electrons plays the dominant role in the emission processes.

astro-ph↗