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Binaries in Globular Clusters

Hut, Piet and McMillan, Steve and Goodman, Jeremy and Mateo, Mario and Phinney, E. S. and Pryor, Carlton and Richer, Harvey B. and Verbunt, Frank and Weinberg, Martin (1992) Binaries in Globular Clusters. Publications of the Astronomical Society of the Pacific, 104 (681). pp. 981-1034. ISSN 0004-6280. doi:10.1086/133085.

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Recent observations have shown that globular clusters contain a significant binary population. This is a dramatic change from the conventional view of even a decade ago, which held that globular clusters formed without any binaries at all, since the observed X-ray binaries were understood to be formed through dynamical capture. Over the last few years, a number of different observational techniques have resulted in the detection of a substantial number of binaries most of which are believed to be primordial. When the many selection effects are taken into account, these detections translate into a binary abundance in globular clusters that may be somewhat smaller than those in the Galactic disk and halo, but not by a large factor. Within the current uncertainties, it is even possible that the primoridal binary abundance in globular clusters is comparable to the Galactic disk. We discuss different successful optical search techniques, based on radial-velocity variables, photometric variables, and the positions of stars in the color-magnitude diagram. In addition, we review searches in other wavelengths, which have turned up low-mass X-ray binaries and more recently a variety of radio pulsars. On the theoretical side, we give an overview of the different physical mechanisms through which individual binaries evolve. We discuss the various simulation techniques which recently have been employed to study the effects of a primordial binary population, and the fascinating interplay between stellar evolution and stellar dynamics which derive globular cluster evolution.

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Additional Information:© 1992 The Astronomical Society of the Pacific. Received 1992 August 9; accepted 1992 August 19. The authors are indebted to Roger Griffin for a thorough and meticulous reading of the manuscript. P.H. and S.M. acknowledge Grant No. AST900013P from the Pittsburgh Supercomputer Center. S.M. acknowledges the support of NASA Award No. NAGW-2559. J.G. was supported by grants from the Alfred P. Sloan Foundation and the David and Lucille Packard Foundation. M.M. acknowledges partial support from NASA through Grant No. HF-1007.01-90A awarded to the Space Telescope Science Institute which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA under Contract No. NAS5-26555, and from a Fullam/Dudley award from the Dudley Observatory. E.S.P. appreciates his support from the Alfred P. Sloan Foundation and NASA Grant No. NAGW-2394. C.P. is grateful to the time allocation committees of the CFHT, MMTO, KPNO, and CTIO for generous allocations of time to study binaries in globular clusters. He thanks his collaborators Taft Armandroff, Sam Barden, Murray Fletcher, Jim Hesser, Dave Latham, Robert McClure, Ed Olszewski, and Bob Schommer for making his research on binaries in globular clusters possible and for allowing him (and sometimes even encouraging him) to write a contribution to this review instead of analyzing our data. Jim Hesser and Robert McClure offered helpful comments on a draft of C.P.’s portion of this review. C.P. acknowledges a grant from the Rutgers University Research Council and Grant No. AST- 9020685 from the National Science Foundation. H.B.R. would like to acknowledge the comments and suggestions of Peter Leonard and Greg Fahlman. H.B.R.’s research is supported by grants from the Natural Sciences and Engineering Research Council of Canada. F.V. is supported by the Netherlands Organization for Scientific Research (NWO) under Grant No. PGS 78-277. M.D.W. thanks IAS for its hospitality and acknowledges the support of NASA award No. NAGW-2224.
Funding AgencyGrant Number
Pittsburgh Supercomputer CenterAST900013P
Alfred P. Sloan FoundationUNSPECIFIED
David and Lucille Packard FoundationUNSPECIFIED
Dudley ObservatoryUNSPECIFIED
Rutgers UniversityUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)PGS 78-277
Issue or Number:681
Record Number:CaltechAUTHORS:20190208-152140301
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Official Citation:Piet Hut et al 1992 PASP 104 981
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92807
Deposited By: Tony Diaz
Deposited On:10 Feb 2019 23:25
Last Modified:16 Nov 2021 03:53

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