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

DOI	Resolve DOI: https://doi.org/10.1086/368137
Author	Search for: Cowley, A. P.; Search for: Schmidtke, P. C.; Search for: Hutchings, J. B.¹; Search for: Crampton, David¹
Affiliation	National Research Council of Canada. NRC Herzberg Institute of Astrophysics
Format	Text, Article
Abstract	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 ~0.40–0.43 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.
Publication date	2003-04-01
Publisher	American Astronomical Society IOP
In	The Astronomical Journal 125 (1 April 2003): 2163–2172.
Language	English
Peer reviewed	Yes
NPARC number	9721954
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Record identifier	32f5ce6f-062d-48a6-a34a-27664042c6f0
Record created	2009-07-17
Record modified	2023-06-26