Supersoft X-ray source in the globular cluster M3 (NGC 5272)

被引：13

作者：

Dotani, T

Asai, K

Greiner, J

机构：

[1] Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan

[2] Inst Astrophys, D-14482 Potsdam, Germany

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 1999年 / 51卷 / 04期

关键词：

clusters : globular; stars : white dwarf; X-rays : binaries; X-rays : sources;

D O I：

10.1093/pasj/51.4.519

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We studied the nature of a transient supersoft X-ray source (SSS), 1E 1339.8+2837, in the globular cluster M3 (NGC 5272) using the ASCA data and the archival ROSAT data. We found that 1E 1339.8+2837 was observed most of the time as a CV-type X-ray source and had a hard energy spectrum approximated by a bremsstrahlung model of 5 keV. It switched to a high state only during 1991-92 at a luminosity of 10(35) erg s(-1), which is larger than that in the low state by nearly two orders of magnitude. We confirmed the very soft energy spectrum characteristic of the SSS during the high state. Thus, 1E 1339.8+2837 is considered to be a white-dwarf binary, making a transition between the SSS and the CV. We discuss a possible model of 1E 1339.8+2837, a dwarf nova including a massive white dwarf.

引用

页码：519 / 524

页数：6

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