Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999iaus..192..253d&link_type=abstract
The stellar content of Local Group galaxies, Proceedings of the 192nd symposium of the International Astronomical Union held in
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We present the results of detailed B, V, R, I, and H alpha study of the isolated nearby blue compact dwarf (BCD) galaxy NGC 6789. Judging from the literature the observed galaxy has not been resolved into stars up to now. On CCD frames obtained with 6-m BTA telescope and 2.5-m Nordic telescope the galaxy is well resolved into stars. Its colour-magnitude diagram confirms two component (core-halo) galaxy morphology, which consists of two stellar populations distinct in structure and colour: an inner high surface-brightness young population within 150 pc from the center of the galaxy, and a relatively low surface-brightness intermediate-age population extending out to at least 600 pc. The distance of the galaxy, estimated from the tip of the red giant branch (TRGB) is 2.1 Mpc which places NGC 6789 close to the Local Group. Using the colour of the RGB, we estimate the metallicity of the halo population. Two acceptable results have been obtained: [Fe/H] = -1.25 dex and [Fe/H] = -0.85 dex.
Drozdovsky Igor
Tikhonov Nikolay
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