Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6734f&link_type=abstract
HST Proposal ID #6734
Computer Science
Hst Proposal Id #6734 Stellar Populations
Scientific paper
Andromeda IV is an enigmatic object, first identified by van den Bergh {1972}, during his photographic survey for dwarf spheroidal galaxy companions to M31, as either an `old star cloud' in the outer disk of M31, or possibly a background dwarf galaxy. We here propose deep WFPC2 V and I imaging of And IV to V> 27, which will resolve stars down to M_V +3, and determine main sequence turnoffs of < 5 * 10^9yr. The mean color of the red giant branch will provide a mean metallicity estimate, while the width constrains the dispersion in metallicity. The AGB and BHB stars provide further age and metallicity constraints. A reliable distance is necessary to establish the location of And IV in the M31 disk; this will be obtained from the I-band magnitude of the tip of the RGB. Ground-based observations are hampered by the proximity of a relatively bright star and by the combination of faintness and crowding in And IV. The extant ground-based CCD photometry for this object, to V 23 {Jones 1993}, have been interpreted as representing a young population with a narrow range of ages, an `unusually large' open cluster. And IV may be large enough that it could represent the transition stage between a single-age star cluster, and a self-enriched, many-generation stellar system. If indeed in the disk of M31, And IV lies beyond 4 disk scalelengths, a typical `edge' of optical disks. It thus could provide a unique example of a large star cluster in the outer regions of a disk, where there is little on-going or past star formation.
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