Color-magnitude diagram for the Andromeda II dwarf galaxy

Details Color-magnitude diagram for the Andromeda II dwarf galaxy Color-magnitude diagram for the Andromeda II dwarf galaxy

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1819k&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 5, p. 1819-1825

Astronomy and Astrophysics

Astronomy

19

Andromeda Galaxy, Color-Magnitude Diagram, Distance, Dwarf Galaxies, Metallicity, Statistical Analysis, Astronomical Photometry, Charge Coupled Devices, Globular Clusters, Image Filters, Reflecting Telescopes

Scientific paper

A color-magnitude diagram for the dwarf galaxy Andromeda II (And II) is presented, based on CCD photometry obtained using the Palomar 5 m telescope and Thuan-Gunn g, r filters. The mean metallicity, the metallicity spread, and the distance to And II are estimated. The mean metallicity of the galaxy is found to be mean value of (Fe/H) = -1.59-0.12+0.44 derived by superimposing globular cluster giant branches. This metallicity is consistent with the accepted MV vs (Fe/H) relationship for dwarf spheroidals. The spread in metallicity seems to be large, sigma approximately 0.43, but we cannot determine the exact value. Andromeda II is estimated to be at a distance of 583-103+124 Kpc, approximately 120 Kpc closer than M31.

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