Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-23
Astronomy and Astrophysics
Astrophysics
8 pages, 2 figures. To appear in New Horizons in Globular Cluster Astronomy, eds. G. Piotto, G. Meylan, G. Djorgovski, & M. Ri
Scientific paper
Binary stars have long been considered to play a crucial role in globular cluster evolution, and offer the advantages of studying systems at the same, well-determined distances. However, early search attempts were consistently thwarted by crowding (particularly in the optical) and initial detections were limited to small numbers of low-mass X-ray binaries (LMXBs) and a handful of other systems. This resolution hurdle has been dramatically overcome by the superb spatial resolution and sensitivity of HST and Chandra (supported by advances in radio observations), enabling the detection in individual clusters of more than 10, and in some cases more than 100, binaries. This review will focus on detections of neutron star binaries, including recent optical identifications, the exciting discoveries of multiple LMXBs in quiescence (with the potential to constrain neutron star equations of state) and the detections of millisecond pulsars (MSPs) in X-ray and optical images.
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