Registration of the First Thermonuclear X-ray Burst from AX J1754.2-2754

Details Registration of the First Thermonuclear X-ray Burst from AX J1754.2-2754 Registration of the First Thermonuclear X-ray Burst from AX J1754.2-2754

2007-10-30

arxiv.org/abs/0710.5597v1

Astron.Lett.33:807-813,2007

Astronomy and Astrophysics

Astrophysics

12 pages, 6 figures

Scientific paper

10.1134/S1063773707120043

During the analysis of the INTEGRAL observatory archival data we found a powerful X-ray burst, registered by JEM-X and IBIS/ISGRI telescopes on April 16, 2005 from a weak and poorly known source AX J1754.2-2754. Analysis of the burst profiles and spectrum shows, that it was a type I burst, which result from thermonuclear explosion on the surface of nutron star. It means that we can consider AX J1754.2-2754 as an X-ray burster. Certain features of burst profile at its initial stage witness of a radiation presure driven strong expansion and a corresponding cooling of the nutron star photosphere. Assuming, that the luminosity of the source at this phase was close to the Eddington limit, we estimated the distance to the burst source d=6.6+/-0.3 kpc (for hidrogen atmosphere of the neutron star) and d=9.2+/-0.4 kpc (for helium atmosphere).

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