Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4664g&link_type=abstract
HST Proposal ID #4664
Physics
Hst Proposal Id #4664
Scientific paper
Through time-series, CCD ensemble photometry of the diverse stellar population in the core of 47 Tucanae, we will detect stellar oscillations of the delta Scuti and dwarf Cepheid type in the blue stragglers. We will also determine the presence and orbital period distribution of contact and cataclysmic binaries in the cluster core. Similar period distributions to those observed in the field would support the suggestion that most cataclysmics and contact binaries were formed in, and ejected from globular clusters. A thorough pulsation study of the about 25 blue stragglers should allow mass determinations in many cases. As the blue stragglers of 47 Tuc are likely the result of stellar collisions, these observations will also yield a thorough survey of the central 66x66 arcsec core region for tightly bound binaries that may serve as precursors to the formation of blue stragglers. We will observe with the PC at a sustained data rate of 3 frames per hour. Since 47 Tuc is in a continuous viewing zone, such observations will be maintained for a 1.5 day period, necessary for detection of low amplitude delta Scuti stars, and to obtain the frequency precisions (8 microHz) needed for detailed interpretation. We expect a total of about 100 frames over 36 hours, each of which will have precision of 4 mag on brightest stars (differential only) at 15th mag, to 0.3 mag at 21st. With some 10000 stars from a most interesting stellar population in this time-series, many serendipitous results may also be expected.
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