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Blue Stragglers in the Core of the Globular Cluster 47 Tucanae

Published online by Cambridge University Press:  30 March 2016

G. Meylan ,
F. Paresce  and
M. Shara
G. Meylan
Affiliation:
Space Telescope Science Institute3700 San Martin Drive Baltimore MD 21218U.S.A.
F. Paresce
Affiliation:
Space Telescope Science Institute3700 San Martin Drive Baltimore MD 21218U.S.A.
M. Shara
Affiliation:
Space Telescope Science Institute3700 San Martin Drive Baltimore MD 21218U.S.A.

Abstract

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High resolution imaging observations of the core of the globular cluster 47 Tucanae with the Faint Object Camera (FOC) on the Hubble Space Telescope (HST) reveal a very high surface density of blue stragglers. This discovery supports the hypothesis that they are among the most massive objects in globular clusters, concentrated in the core by mass segregation. Taken together with the presence in 47 Tue of an X-ray source, eleven millisecond and binary pulsars, and two high-velocity stars ejected out of the core, these observations favour the scenario that blue stragglers are either mergers formed through coalescent collisions, or binaries formed through close encounters.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 9: Highlights of Astronomy. As presented at the XXIst General Assembly of the IAU, 1991 , 1992 , pp. 451 - 453
Copyright
Copyright © Kluwer 1992

References

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