ACCURATE PERIOD DETERMINATION OF AN ECLIPSING BINARY-X-RAY SOURCE IN M33

被引：12
|
作者：
SCHULMAN, E
BREGMAN, JN
COLLURA, A
REALE, F
PERES, G
机构：
[1] CNR,IST APPLICAZIONI INTERDISCIPLINARI FIS,PALERMO,ITALY
[2] INST OSSERV ASTRON,I-90134 PALERMO,ITALY
[3] OSSERV ASTROFIS CATANIA,I-95125 CATANIA,ITALY
来源：
ASTROPHYSICAL JOURNAL | 1993年 / 418卷 / 02期
关键词：
BINARIES; ECLIPSING; GALAXIES; INDIVIDUAL; M33; STARS; (M33; X-7); X-RAYS;
D O I：
10.1086/187118
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have analyzed the time variability of one of the X-ray sources in M33 observed by both the ROSAT and Einstein Observatory telescopes. The light curve of M33 X-7 exhibits a variability pattern of high and low states, suggesting an eclipsing binary X-ray source. The data suggest a binary period P = 1.78572 days (very close to that of Her X-1) and an eclipse duration of approximately 0.4 days. The low phase lasts about one-fourth of the period as in Cen X-3.
引用
收藏
页码：L67 / L70
页数：4
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