AAS 195th Meeting, January 2000
Session 90. Gas in Galaxies
Oral, Friday, January 14, 2000, 10:00-11:30am, Regency VII

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[90.03] The Star Formation History of UGCA 290, a Bimodal Blue Compact Dwarf

M.M. Crone (Skidmore College), R.E. Schulte-Ladbeck (U. Pittsburgh), U. Hopp (U. Muenchen), L. Greggio (O.A. Bologna and U. Muenchen)

We present single-star photometry of UGCA 290, a nearby blue dwarf galaxy traditionally described as an interacting binary. Cycle 8 HST/WFPC2 observations resolve thousands of individual stars in this galaxy, allowing the construction of a color magnitude diagram (CMD) to an absolute magnitude of approximately MI = -2.5. In addition to the bimodal starburst, we find a scattered distribution of older red giant stars. Comparing these data with synthetic CMDs, we discuss the star-formation history of this galaxy.

Based on observations with the NASA/ESA Hubble Space Telescope. Support for this work was provided by NASA through grant number GO-08122.02-97A from the STScI, which is operated by AURA, Inc. under NASA contract NAS5-26555.

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