The giant branch of Leo I

Details The giant branch of Leo I The giant branch of Leo I

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1381f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, June 1987, p. 1381-1387. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

19

Color-Magnitude Diagram, Dwarf Galaxies, Giant Stars, Astronomical Photometry, Carbon Stars, Interstellar Extinction, Metallicity, Morphology

Scientific paper

A color-magnitude diagram down to V = 22 is presented for the dwarf spheroidal galaxy Leo I. The morphology of the color-magnitude diagram is found to be strikingly similar to that of Leo II and Fornax. A prominent, wide giant branch is visible, indicating a spread in metallicity of nearly 1.0 dex, with a mean around [Fe/H] = -1.4. The traditional distance modulus of (m-M) = 21.8 is confirmed. Known carbon stars are found to lie at or above the tip of the first giant branch. An AGB is also seen, but the horizontal branch (presumably at V ≡ 22.5) is fainter than the limit of the data.

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