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Comparative Morphology of the HST1 Color-Magnitude Diagram of the Nearby Blue Compact Dwarf Galaxy VII Zw 403 with that of Local Group Dwarfs

Published online by Cambridge University Press:  25 May 2016

R.E. Schulte-Ladbeck ,
U. Hopp  and
M. M. Crone
R.E. Schulte-Ladbeck
Affiliation:
University of Pittsburgh, Pittsburgh, PA 15260
U. Hopp
Affiliation:
Universitätssternwarte München, FRG
M. M. Crone
Affiliation:
Skidmore College, Saratoga Springs, NY 12866

Abstract

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There are no examples of Blue Compact Dwarf (BCD) galaxies known within the Local Group (LG). Multicolor HST/WFPC2 observations of the nearby BCD VII Zw 403 (= UGC 6456) now resolve single stars with the quality (in terms of limiting magnitude and completeness) previously achieved for LG dwarfs from the ground. We use the MI, V - I color-magnitude diagrams (CMDs) of several LG dwarfs as templates to assess the stellar content and star-formation history (SFH) of the BCD VII Zw 403. This is the first BCD for which a clear spatial segregation of the resolved stellar content into a “core-halo” structure is detected: active star formation is observed in the central region of VII Zw 403, while in “Baade's red sheet”, this young population is strikingly absent. If BCD halos are home to dominant ancient stellar populations, then the fossil record conflicts with delayed-format ion scenarios for dwarfs. We present a sketch of the SFH in the core and halo of VII Zw 403.

Type
Part 4. Morphology, Kinematics and Dynamics
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 464 - 468
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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