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2000AJ....119.2183A - Astron. J., 119, 2183-2193 (2000/May-0)
The spatial and age distribution of stellar populations in DDO 190.
APARICIO A. and TIKHONOV N.
Abstract (from CDS):
The surface brightness distribution of the galaxy is well fitted by ellipses of ellipticity e=1-a/b=0.1 and position angle of 82°. The radial star density distribution follows an exponential law of scale length α=43".4, corresponding to 611 pc. The Holmberg semimajor axis to µB=26.5 is estimated to be rB26.5=3'.0. Stellar populations of different ages in DDO 190 show strong spatial decoupling, the oldest population appearing much more extended than the youngest. Stars younger than 0.1 Gyr occupy only the central 40" (0.55 kpc); stars younger than a few (∼4) Gyr extend out to ∼80" (125 kpc), and for larger galactocentric distances, only older stars seem to be present. This behavior is found in all the dIrr galaxies for which spatially extended studies have been performed and could be related to the kinematic history of the galaxy.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Distances and Redshifts - galaxies: individual (DDO 190) - Galaxies: Irregular - Galaxies: Stellar Content - Galaxies: Structure
Nomenclature: Table 2, Fig.5: [AT2000] N (Nos 1-8).
Simbad objects: 7
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