Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999iaus..192..268l&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
DDO 210 is a dwarf irregular galaxy which is resolved in the ground-based images. The distance to this galaxy has been known to be very uncertain, with literature values ranging from 1 Mpc to 4 Mpc. It has been sometimes considered to be a member of the Local Group and sometimes not. Deep VI CCD photometry of DD0 210 obtained in this study shows that the resolved stellar population in this galaxy consists of a dominant old red giant population and some young stars. We have estimated the distance to this galaxy for the first time using an accurate distance indicator. We have used the I-band magnitude of the tip of the red giant branch, which is an accurate distance indicator, obtaining a value of about 1 Mpc. This result shows that DDO 210 is located approximately at the outer boundary of the Local Group.
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