Cataclysmic Variables and Millisecond Pulsars in Globular Cluster Cusps

Details Cataclysmic Variables and Millisecond Pulsars in Globular Cluster Cusps Cataclysmic Variables and Millisecond Pulsars in Globular Cluster Cusps

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2555g&link_type=abstract

HST Proposal ID #2555

Computer Science

Hst Proposal Id #2555

Scientific paper

We propose to use the PC to obtain H-alpha and comparison wide band red images of the nearby globular cluster NGC6752 which appears to be in an advanced stage of dynamical evolution. We will use these data for a color map analysis (Bailyn et al. 1988) and DAOPHOT crowded field photometry, in order to:(1) search for H-alpha emission objects including cataclysmic variables and nebulae surrounding millisecond pulsars (MSPs) and planetary nebulae, (2) search for diffuse H-alpha emission from a centrally concentrated population of the former two types of objects, and (3) study the radial distribution of H-alpha absorption line objects including faint blue horizontal branch stars (FBHBs). The central goal of our study is to test predictions of models for cluster dynamical evolution that predict the production of a substantial population of compact binaries due to a high rate of close stellar encounters in dense collapsed cluster cores. Our choice of one of this cluster that shows evidence of having undergone core collapse enhances the likelihood that the emission line objects expected from stellar encounters can be directly detected and resolved. Our search is distinctly different from, and more sensitive than, compact binary searches being planned by several GTO investigators.

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