期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 348, 期 1, 页码 L7-L11出版社
BLACKWELL PUBLISHING LTD
DOI: 10.1111/j.1365-2966.2004.07486.x
关键词
binaries : close; stars : individual : 2S 0918-449; stars : individual : 4U 0614+09; stars : individual : 4U 1543-624
We present optical spectra in the range 4600-8600 Angstrom for three low-mass X-ray binaries which have been suggested to belong to the class of ultra-compact X-ray binaries based on their X-ray spectra. Our spectra show no evidence for hydrogen or helium emission lines, as are seen in classical X-ray binaries. The spectrum of 4U 0614 + 09 does show emission lines, which we identify with carbon and oxygen lines of C II, CIII, OII and OIII. While the spectra of 4U 1543 624 and 2S 0918 549 have a lower signal-to-noise ratio, and thus are more difficult to interpret, some of the characteristic features of 4U 0614 + 09 are present in these spectra too, although sometimes they are clearly weaker. We conclude that the optical spectra give further evidence for the ultra-compact nature of these X-ray binaries and for their donor stars being carbon-oxygen white dwarfs.
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