Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sciam.237...42c&link_type=abstract
Scientific American, vol. 237, Oct. 1977, p. 42-55.
Astronomy and Astrophysics
Astronomy
2
Globular Clusters, Neutron Stars, Stellar Mass Accretion, X Ray Sources, X Ray Stars, Binary Stars, Black Holes (Astronomy), Milky Way Galaxy, Sas, Star Clusters, Stellar Evolution
Scientific paper
Observations of stellar X-ray sources in globular clusters are reviewed along with X-ray emission mechanisms and some general characteristics of globular star clusters. The formation of globular clusters is discussed, and it is shown how X-ray stars can arise in both the galactic disk and globular clusters. Neutron-star formation is described, the ages of globular-cluster stars and the mass range for main-sequence stars that evolve into neutron stars are investigated, and mass transfer in massive close binaries is examined. The preferential occurrence of X-ray stars in the globular-cluster star population is noted, and a consistent explanation is sought for both the origin of X-ray stars in globular clusters and their much greater relative frequency of occurrence. Possible sources of X-ray emission in globular clusters are considered, including mass-transfer binary systems and massive black holes in dense cluster cores. X-ray observations of various globular clusters are summarized which demonstrate that X-ray burst sources occur preferentially but not exclusively in globular clusters.
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