AAS 203rd Meeting, January 2004
Session 115 Dwarf, Irregular and Starburst Galaxies
Poster, Thursday, January 8, 2004, 9:20am-4:00pm, Grand Hall

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[115.26] The Role of Environment on the Star Formation Histories of Dwarf Irregular Galaxies

J. M. Dunn, P. M. Marcum (TCU), M. N. Fanelli (UNT)

We are investigating the star formation histories and evolution of 36 dwarf irregular galaxies that reside in one of two different environments. The objects are classified as either high-density (neighbor galaxy within 250 kpc) or low-density (no known neighbors within 1 Mpc). These low-mass systems, being more reactive to external perturbations, are a type of ''accelerated experiment'' in galaxy evolution, making them ideal targets for a study on the effects environment has on star formation.

To date, we have obtained H-alpha and R-band images for 9 of the 36 galaxies, as well as J-band images for 5 of the galaxies. We present analysis of the data thus obtained and discuss the capability of acquiring near-infrared images of these systems. UBVRI and H-alpha imaging are planned for all 36 galaxies. In addition, optical spectroscopy will be obtained for a select sub-sample of targets.

The author(s) of this abstract have provided an email address for comments about the abstract: j.m.kerley@tcu.edu

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.