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Astron. Astrophys. 357, L21-L24 (2000)

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Letter to the Editor

The longest thermonuclear X-ray burst ever observed?

A BeppoSAX Wide Field Camera observation of 4U 1735-44

R. Cornelisse 1,2, J. Heise 1, E. Kuulkers 1,2, F. Verbunt 2 and J.J.M. in 't Zand 1

1 Space Research Organization Netherlands, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
2 Astronomical Institute, P.O.Box 80000, 3508 TA Utrecht, The Netherlands

Received 3 March 2000 / Accepted 30 March 2000


A long flux enhancement, with an exponential decay time of 86 min, is detected in 4U 1735-44 with the BeppoSAX Wide Field Cameras. We argue that this is a type I X-ray burst, making it the longest such burst ever observed. Current theories for thermonuclear bursts predict shorter and more frequent bursts for the observed persistent accretion rate.

Key words: accretion, accretion disks – stars: neutron – book reviews – X-rays: bursts

Send offprint requests to: R. Cornelisse

Correspondence to: R.Cornelisse@sron.nl

© European Southern Observatory (ESO) 2000

Online publication: May 3, 2000