AAS 195th Meeting, January 2000
Session 8. Dwarf, Irregular and Starburst Galaxies
Display, Wednesday, January 12, 2000, 9:20am-6:30pm, Grand Hall

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[8.03] The HST Snapshot Survey of Nearby Dwarf Galaxy Candidates. III. Resolved Dwarf Galaxies In and Beyond the Local Group

E.K. Grebel (U Wash), P. Seitzer (U Mich), A.E. Dolphin (NOAO), D. Geisler (U Concepción), P. Guhathakurta (UCSC), P.W. Hodge (U Wash), I.D. Karachentsev (SAO), V.E. Karachentseva (U Kiev), A. Sarajedini (Wesleyan U), M.E. Sharina (SAO)

We present results for several nearby, resolved dwarf galaxies imaged with WFPC2 in the framework of our HST snapshot survey of nearby dwarf galaxy candidates (Seitzer et al., paper I in this series). All data presented here were analyzed with the automated photometry package HSTPHOT (Dolphin et al., paper IV in this series).

Our closest target is the recently discovered Cassiopeia dwarf spheroidal (dSph) galaxy (Karachentsev & Karachentseva 1999, A&A, 341, 355), a new Local Group member and companion of M31 (Grebel & Guhathakurta 1999, ApJ, 511, 101). Our WFPC2 snapshot data reveal a pronounced red horizontal branch in Cas dSph. IC\,5152 is a dwarf irregular (dIrr) just beyond the Local Group. Our data show a significant intermediate-age population with a strongly tilted asymptotic giant branch (AGB), a substantial young population, and a wide giant branch.

Other nearby galaxies to be discussed include NGC\,1560, ESO\,471-G006, ESO\,470-G018, and KK\,035. Most of these galaxies are being resolved into stars for the first time. We describe their properties in detail and derive distances for all dwarfs with a well-defined tip of the red giant branch. Membership of these galaxies in nearby groups is discussed.

Support for this work was provided by NASA through grant GO-08192.97A from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. EKG acknowledges support by NASA through grant HF-01108.01-98A from the Space Telescope Science Institute. EKG and IDK are supported by the Henri Chrétien International Research Grant administered by the American Astronomical Society. PG is an Alfred P.\ Sloan Research Fellow.

If you would like more information about this abstract, please follow the link to http://www.astro.lsa.umich.edu/users/seitzer/snapshot/. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser. [Previous] | [Session 8] | [Next]