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Nearby Blue Compact Dwarf Galaxy NGC 6789

Published online by Cambridge University Press:  25 May 2016

I. Drozdovsky  and
N. Tikhonov
I. Drozdovsky
Affiliation:
Astronomical Institute, St.-Petersburg State University, Petrodvoretz, 198904, Russia
N. Tikhonov
Affiliation:
Special Astrophysical Observatory, N.Arkhyz, Karachai-Circassian Rep., 357147, Russia

Abstract

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We present the results of a detailed BVRI and Hα study of the isolated nearby blue compact dwarf (BCD) galaxy NGC 6789. Judging from the literature the observed galaxy has not yet been resolved into stars up to now. On CCD frames obtained with 6m BTA telescope and 2.5m Nordic telescope the galaxy is well resolved. Its colour-magnitude diagram confirms the 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 to 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. From the mean colour of the RGB, the mean metal abundance of the halo population is estimated as [Fe/H] ≃ −1 dex.

Type
Part 2: The Database
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 253 - 258
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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