Interacting Binary Stars in the Cores of Globular Clusters

Details Interacting Binary Stars in the Cores of Globular Clusters Interacting Binary Stars in the Cores of Globular Clusters

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2472s&link_type=abstract

HST Proposal ID #2472

Physics

Hst Proposal Id #2472

Scientific paper

If Theorists' suggestions are correct, dozens of cataclysmic binaries (formed by tidal capture) and W UMa contact binaries, (and perhaps a few massive disk stars and/or 1 or 2 low-mass X-ray binaries) should be found in the inner few core radii of every globular cluster. These objects (if they exist) are the dominant dynamical energy sources and sinks of their host clusters. Testing the long-standing prediction of these objects' existence is crucial in advancing our understanding of the structures and evolution of globulars, and is the main thrust of this proposal. We will use the expected time variability and/or the extremely blue colors of these binaries, and the HST Faint Object Camera to: 1) demonstrate that these objects exist in globular cores, and 2) determine preliminary orbital period distributions, radial gradients in globulars, and luminosity functions. The high angular resolution and ultraviolet sensitivity of HST and the FOC are crucial to the success of this program. All three targets are in HST's continuous viewing zone, and thus the proposed observations make extremely efficient use (75%) of HST time.

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