Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..964l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 3, p. 964-985.
Astronomy and Astrophysics
Astronomy
70
Asymptotic Giant Branch Stars, Dwarf Galaxies, Early Stars, Elliptical Galaxies, Red Giant Stars, Astronomical Photometry, Color-Magnitude Diagram, Interstellar Extinction, Local Group (Astronomy), Metallicity, Stellar Color, Stellar Magnitude
Scientific paper
The study presents BVRI CCD photometry of about 5300 stars in the central area of the dwarf elliptical galaxy NGC 185 in the Local Group. The color-magnitude diagram shows three distinct stellar populations: a dominant RGB population, AGB stars located above the tip of the RGB stars, and a small number of young stars having blue to yellow colors. The foreground reddening is estimated to be 0.19 +/- 0.03 mag using the (B - V) - (V - I) diagram for the bright foreground stars with good photometry. Surface photometry of the central area of NGC 185 is presented; it shows that the colors become rapidly bluer inside R of about 10 arcsec. Structural parameters indicate that the mass-to-luminosity ratio ranges from 3 to 5.
Freedman Wendy L.
Lee Myung G.
Madore Barry F.
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