A&A 434, 1069-1075 (2005)
DOI: 10.1051/0004-6361:20041846

INTEGRAL detection of a long powerful burst from SLX 1735-269

S. Molkov^{1, 2}, M. Revnivtsev^{1, 2}, A. Lutovinov¹ and R. Sunyaev<sup>1, 2

1</sup>  Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117997 Moscow, Russia
    e-mail: molkov@hea.iki.rssi.ru
²  Max-Plank-Institute für Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching bei München, Germany

(Received 13 August 2004 / Accepted 21 December 2004)

Abstract
We present results of an analysis of the bursting behavior of the low mass X-ray binary system SLX 1735-269 during INTEGRAL observations of the Galactic Center region in 2003. Six type-I X-ray bursts were detected in total with one being much longer and more powerful then the others. A strong dependence of the burst recurrence time on the mass accretion rate is observed, that is likely caused by a change in the burning regime. The long burst demonstrated a photospheric radius expansion. We discuss possible scenarios of this long burst and show that it is unlikely a carbon burning flash but rather burning of a large pile of hydrogen and helium accelerated by electron capture processes in a dense accumulated layer.

Key words: X-rays: binaries -- X-rays: individuals: SLX 1735-269

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© ESO 2005

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