Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360l..39m&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. L39-L41.
Astronomy and Astrophysics
Astrophysics
16
Astronomical Photography, Background Radiation, Charge Coupled Devices, Dwarf Galaxies, Irregular Galaxies, Stellar Composition, Galactic Clusters, Galactic Evolution
Scientific paper
The stellar population of the irregular galaxy DDO 210 has been resolved down to V = 23.5 on CCD images centered at coordinates rather different from those quoted in the literature. DDO 210 turns out to be highly contaminated by foreground stars and by background galaxies belonging to a distant cluster. The actual stellar population of this irregular appears to be quite faint and red. If the adopted distance modulus is correct, the possible interpretation of the resulting color-magnitude diagram is twofold: either DDO 210 contains only stars older than 1 Gyr, or it contains stars as young as a few Myr, which are affected by a reddening E(B - V) of about 0.4, much larger than that normally attributed to that region of the sky.
Focardi Paola
Greggio Laura
Marconi Gianni
Tosi Mia
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