ORBITAL PARAMETERS OF THE CANDIDATE BLACK-HOLE BINARY GRO J0422+32

被引:46
作者
OROSZ, JA [1 ]
BAILYN, CD [1 ]
机构
[1] YALE UNIV,DEPT ASTRON,NEW HAVEN,CT 06510
关键词
BINARIES; SPECTROSCOPIC; BLACK HOLE PHYSICS; X-RAYS; STARS; INDIVIDUAL (GRO J0422+32);
D O I
10.1086/187930
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present optical observations of the black hole candidate GRO J0422+32 in quiescence. CCD imaging over a period of two nights reveals ellipsoidal variations with an amplitude of approximate to 0.15 mag in I and a period of 0(d).2107 +/- 0(d).0012. This period is consistent with periods found during the decay from outburst. The optical spectra show strong double-peaked Balmer emission lines (characteristic of emission from an accretion disk) with a separation of similar to 910 km s(-1), implying that the projected velocity of the outer edge of the accretion disk is 455 +/- 15 km s(-1), which in turn implies a velocity semiamplitude for the secondary star of less than or similar to 400 km s(-1) The spectra also show TiO absorption bands indicative of early M-type dwarfs. The signal-to-noise ratios in the individual spectra are too low to extract reliable velocities. However, analyzing the full data set, we find that the most probable range of values of the secondary star velocity semiamplitude is 300 less than or equal to K-2, less than or equal to 400 km s(-1). The implied range of mass functions is then 0.5 less than or equal to f(M) less than or equal to 1.4 M.. The primary mass will then be greater s than 3 M. if the orbital inclination is less than 59 degrees and the secondary star mass is less than 0.5 M..
引用
收藏
页码:L59 / L62
页数:4
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