Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...447..473b&link_type=abstract
Astronomy and Astrophysics, Volume 447, Issue 2, February IV 2006, pp.473-480
Astronomy and Astrophysics
Astrophysics
6
Galaxies: Individual: Ddo 190, Galaxies: Dwarf, Stars: Carbon, Stars: Agb And Post-Agb, Galaxies: Fundamental Parameters
Scientific paper
We have carried out deep R, I, CN, TiO observations of the dwarf irregular galaxy DDO 190. We confirm the existence of an intermediate-age population around this galaxy. The identification of 47 carbon stars seen up to 5 arcmin from the centre of the galaxy implies that the population distribution of DDO 190 is similar to those found in some other Local Group dIrr galaxies. An estimate of the metallicity, [Fe/H] = -1.55 ± 0.12, is obtained based on the observed C/M ratio. From the analysis of star counts, corrected for the radial variation of the incompleteness level, we determine a scale-length α = 40 ± 5'', in agreement with the recent literature.
Battinelli Paolo
Demers Serge
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