Deep CCD photometry of the dwarf spheroidal galaxy Leo II

Details Deep CCD photometry of the dwarf spheroidal galaxy Leo II Deep CCD photometry of the dwarf spheroidal galaxy Leo II

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261..657d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 3, p. 657-673.

Astronomy and Astrophysics

Astronomy

29

Astronomical Photometry, Color-Magnitude Diagram, Dwarf Galaxies, Galactic Structure, Local Group (Astronomy), Charge Coupled Devices, Spheroids

Scientific paper

We present a deep color-magnitude diagram of the central 7 x 7 sq arcmin region of Leo II. The diagram shows a well-defined giant branch and a red horizontal branch, heavily populated on the red side but extending far into the blue. Having a low metallicity, /(Fe/H) = -1.9/, the Leo II diagram is similar to those of outer halo clusters suffering from the second-parameter syndrome. From the mean apparent magnitude of candidate RR Lyrae stars (22.10), we estimate the distance of Leo II to be 215 kpc, a value similar to previous estimates. A number of variable-star candidates are identified and two new very red giants have been found. Comparison with the other dwarf spheroidals of the Local Group reveals that Leo II belongs to the group of four small and faint dwarf spheroidal galaxies.

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