UV spectroscopy of the X-ray binary AC211 (= 4U2127 + 11) in M15

Details UV spectroscopy of the X-ray binary AC211 (= 4U2127 + 11) in M15 UV spectroscopy of the X-ray binary AC211 (= 4U2127 + 11) in M15

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255....1n&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 1, 1992, p. 1-6.

Astronomy and Astrophysics

Astronomy

10

Accretion Disks, Astronomical Spectroscopy, Globular Clusters, Ultraviolet Spectroscopy, X Ray Binaries, Absorption Spectra, Helium, Hot Stars, Interstellar Extinction, Iue, Stellar Spectra

Scientific paper

Time-resolved International Ultraviolet Explorer observations are presented of the low-mass X-ray binary AC211/4U2127 + 11 in the globular cluster M15 (NGC 7078). The spectra show He II 1640-A emission, the flux of which is modulated on the 8.5-hr orbital period of AC211. This modulation and the ratio of He II 1640 A to He II 4686 A and C IV 1550 A imply that the He II lines originate in an accretion disk corona. In addition there are absorption lines typical of hot stars, but it is unclear whether they originate in AC211, or surrounding horizontal-branch stars. A comparison is made of the reddening derived from the 2200-A feature in the present spectra with earlier determinations.

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