Binaries in Globular Clusters Augmentation: Cycle 2 Observations

Details Binaries in Globular Clusters Augmentation: Cycle 2 Observations Binaries in Globular Clusters Augmentation: Cycle 2 Observations

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.4056m&link_type=abstract

HST Proposal ID #4056

Computer Science

Hst Proposal Id #4056

Scientific paper

The pre-launch FOS GTO program proposed a systematic study of degenerate stars in binary systems, both in the field and in globular clusters, plus a handful of related objects. For the isolated field systems, the emphasis is on spectro- photometry (in many cases time-resolved over a pulse or orbital period) and spectropolarimetry, to observe the effects of the intense ionizing flux emitted by the compact object on the nearby normal star and/or accretion disk. While some such effects are seen from the ground, they should be far more spectacular in the UV. The GTO program for the globular cluster systems typically proposes WF/PC or FOC images to locate candidates for cluster X-ray sources, followed by confirming FOS spectroscopy. Our published FOC observations of M14 show that even with the primary's spherical aberration, it is possible to reach flux levels relevant to these problems with angular resolution far better than achievable from the ground. Even one or two new close binaries identified through this program will be extremely important, as these systems are thought to dominate the kinetic energy budget of globular clusters, yet virtually none are currently known. Also proposed for augmentation are two related programs: FOS observations of the Crab pulsar and a study of UV-bright objects in globular cluster cores. The increased FOS integration times caused by the spherical aberration have drastically disrupted the original intended scientific program; augmentation proposed here partially restores these efforts.

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