A spectroscopic and photometric study of the eclipsing low-mass X-ray binary 2A 1822-371 (V691 coronae australis)

被引：14

作者：

Cowley, AP ^{[1
]}

Schmidtke, PC

Hutchings, JB

Crampton, D

机构：

[1] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA

[2] Natl Res Council Canada, Herzberg Inst Astrophys, Dominion Astrophys Observ, Victoria, BC V9E 2E7, Canada

来源：

ASTRONOMICAL JOURNAL | 2003年 / 125卷 / 04期

关键词：

binaries : close stars : individual (2A 1822-371); X-rays;

D O I：

10.1086/368137

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Spectroscopy and concurrent optical photometry of the low-mass X-ray binary 2A 1822-371 (V691 CrA) are analyzed. Knowledge of the orbit, based on previously derived parameters for the pulsar, allows us to use our resolved double He I absorption velocities to further constrain the mass of the donor star at similar to0.40-0.43 M-.. This star must be somewhat evolved, since a main-sequence star of this mass would not fill its Roche lobe. The accretion flow within the system is found to be very stratified, with higher ionization lines showing the greatest velocities. The negative systemic velocity suggests the system may belong to the halo population.

引用

页码：2163 / 2172

页数：10

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