The Stellar Content of NGC 6789, A Blue Compact Dwarf Galaxy in the Local Void

Details The Stellar Content of NGC 6789, A Blue Compact Dwarf Galaxy in the Local Void The Stellar Content of NGC 6789, A Blue Compact Dwarf Galaxy in the Local Void

2001-02-26

arxiv.org/abs/astro-ph/0102452v1

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, ApJL Accepted

Scientific paper

10.1086/320021

We find that NGC6789 is the most nearby example of a Blue Compact Dwarf galaxy known to date. With the help of WFPC2 aboard the Hubble Space Telescope, we resolve NGC6789 into over 15,000 point sources in the V and I bands. The young stars of NGC6789 are found exclusively near the center of the galaxy. The red giant population identified at large galacticentric radii yields a distance of about 3.6 Mpc, a stellar metallicity [Fe/H] of about -2, and a minimum age of about 1 Gyr. Despite its isolated location in the Local Void,its low metallicity, and its active star formation, the properties of NGC6789 are clearly not those of a galaxy in formation.

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