Other
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380..441f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 20, 1991, p. 441-451.
Other
20
Globular Clusters, Halos, Red Giant Stars, Stellar Mass Ejection, X Ray Sources, Bow Waves, Interstellar Gas, Novae, Shock Waves, Stellar Evolution
Scientific paper
This paper examines the possibility that the diffuse soft (0.5-3.5 keV) X-ray features observed in three globular clusters by Hartwick et al. (1982) arise through the interaction of intracluster gas with the Galactic halo medium. The bulk of this gas is assumed to be shed during the red giant evolution of cluster stars, although its properties might be greatly modified by other events such as novae. Three types of possible interaction with the halo medium are considered: (1) the formation of a bow shock as an intracluster gas reservoir translates with a cluster and thus impacts the medium; (2) the direct interaction of a shell ejected from a star by an energetic mass loss event accompanying the helium core flash; and (3) interactions associated with nova outbursts in a cluster. In no case does the interaction produce soft X-ray emission which is luminous enough to explain the observed diffuse sources. Thus the various theories describing the possible fate of gas shed by stars within globular clusters continue to lack observational verification.
Faulkner Donald J.
Smith Graeme H.
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