An emission-line object in the core of M15

Details An emission-line object in the core of M15 An emission-line object in the core of M15

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.323..417c&link_type=abstract

Nature (ISSN 0028-0836), vol. 323, Oct. 2, 1986, p. 417-419.

Physics

36

Emission Spectra, Globular Clusters, Stellar Spectra, Variable Stars, X Ray Stars, Balmer Series, Heao 2, Horizontal Branch Stars, Red Giant Stars, Stellar Mass Ejection

Scientific paper

The only northern globular cluster containing a bright X-ray source is M15, which has the extremely ultraviolet and variable star AC 211 near the X-ray error circle. The authors have discovered strong He II 4686 Å emission from the region of AC 211, and weaker Balmer emission. They conclude that it is an intrinsically high-luminosity X-ray source on the basis of the optical brightness of the star and the He II flux. As the observed LX is only 6×1036erg s-1, this implies that the system is at a high inclination and that only scattered X-rays from an extended region are observed.

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