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The ultraviolet line spectrum of the soft X-ray transient XTE J1118+480: a CNO-processed core exposed

Haswell, C.A.; Hynes, R.I.; King, A.R. and Schenker, K. (2002). The ultraviolet line spectrum of the soft X-ray transient XTE J1118+480: a CNO-processed core exposed. Monthly Notices of the Royal Astronomical Society, 332(4) pp. 928–932.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1046/j.1365-8711.2002.05369.x
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Abstract

We compare ultraviolet (UV) spectra of the recent soft X-ray transients XTE J1118+480 and XTE J1859+226. The emission line strengths in XTE J1118+480 strongly suggest that the accreting material has been CNO processed. We show that this system must have come into contact with a secondary star of about 1.5 M, and an orbital period 15 h, very close to the bifurcation value at which the nuclear and angular momentum loss time-scales are similar. Subsequent evolution to the current period of 4.1 h was driven by angular momentum loss. In passing through a period of 7.75 h the secondary star would have shown essentially normal surface abundances. XTE J1118+480 could thus represent a slightly later evolutionary stage of A0620-00. We briefly discuss the broad Lyα absorption wings in XTE J1118+480.

Item Type: Journal Article
ISSN: 1365-2966
Extra Information: Some of the symbols may not have transferred correctly into this bibliographic record.
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 4427
Depositing User: Users 6827 not found.
Date Deposited: 06 Jul 2006
Last Modified: 02 Dec 2010 19:51
URI: http://oro.open.ac.uk/id/eprint/4427
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