A superburst from 4U 1254-69

被引：53
作者：
in't Zand, JJM
Kuulkers, E
Verbunt, F
Heise, J
Cornelisse, R
机构：
[1] SRON, Natl Inst Space Res, NL-3584 CA Utrecht, Netherlands
[2] Univ Utrecht, Inst Astron, NL-3508 TA Utrecht, Netherlands
[3] ESA, ESTEC, Sci Ops & Data Syst Div, SCI SDG, NL-2201 AZ Noordwijk, Netherlands
[4] Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England
来源：
ASTRONOMY & ASTROPHYSICS | 2003年 / 411卷 / 03期
关键词：
stars : neutron; X-rays : binaries; X-rays : bursts; X-rays : individual : 4U 1254-69;
D O I：
10.1051/0004-6361:20031586
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the detection with the BeppoSAX Wide Field Cameras of a superburst from 4U 1254-69. The superburst is preceded by a normal type-I X-ray burst, has a decay time that is the longest of all eight superbursts detected so far and a peak luminosity that is the lowest. Like for the other seven superbursts, the origin is a well-known type-I X-ray burster with a persistent luminosity level close to one tenth of the Eddington limit. Based on WFC data of all persistently bright X-ray bursters, the average rate of superbursts is 0.51 +/- 0.25 per year per persistently bright X-ray burster. Some systems may have higher superburst rates. For all superbursters, we present evidence for a pure helium layer which is burnt in an unstable as well as a stable manner.
引用
收藏
页码：L487 / L491
页数：5
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