Discovery of pulsed X-ray emission from the small magellanic cloud transient RX J0117.6-7330

被引:23
作者
Macomb, DJ [1 ]
Finger, MH
Harmon, BA
Lamb, RC
Prince, TA
机构
[1] NASA, Goddard Space Flight Ctr, High Energy Astrophys Lab, Greenbelt, MD 20771 USA
[2] Univ Space Res Assoc, Astrophys Program, Greenbelt, MD USA
[3] NASA, George C Marshall Space Flight Ctr, Space Sci Lab, Huntsville, AL 35812 USA
[4] CALTECH, Space Radiat Lab, Pasadena, CA 91125 USA
基金
美国国家航空航天局;
关键词
accretion; accretion disks; stars : individual (RX J0117.6-7330); X-rays : general;
D O I
10.1086/312074
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on the detection of pulsed, broadband, X-ray emission from the transient source RX J0117.6-7330. The pulse period of 22 s is detected by the ROSAT/PSPC instrument in a 1992 September 30-October 2 observation and by the Compton Gamma-Ray Obselvatory/BATSE instrument during the same epoch. Hard X-ray pulsations are detectable by BATSE for approximately 100 days surrounding the ROSAT observation (1992 August 28-December 8). The total directly measured X-ray luminosity during the ROSAT observation is 1.0 x 10(38) (d/60 kpc)(2) ergs s(-1). The pulse frequency increases rapidly during the outburst, with a peak spin-up rate of 1.2 x 10(-10) Hz s(-1) and a total frequency change of 1.8%. The pulsed percentage is 11.3% from 0.1-2.5 keV, increasing to at least 78% in the 20-70 keV band. These results establish RX J0117.6-7330 as a transient Be binary system.
引用
收藏
页码:L99 / L102
页数:4
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