Deep CCD photometry of the Sextans dwarf spheroidal galaxy

Details Deep CCD photometry of the Sextans dwarf spheroidal galaxy Deep CCD photometry of the Sextans dwarf spheroidal galaxy

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..892m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 892-910, 1102-1113.

Other

48

Astronomical Photometry, Dwarf Galaxies, Galactic Evolution, Star Distribution, Stellar Evolution, Color-Magnitude Diagram, Elliptical Galaxies, Hertzsprung-Russell Diagram, Metallicity, Red Giant Stars

Scientific paper

BV CCD photometry of Sextans obtained with the prime-focus camera of the 4-m telescope at CTIO in March-April 1990 is reported. The data are presented in extensive tables and graphs and analyzed in detail. Features discussed include a main-sequence turnoff at V = about 23.3, a mainly red horizontal branch at V = 20.35 + or - 0.2, a well populated instability strip (implying up to 300 RR Lyrs and Cepheids in the galaxy), Fe/H = -1.5 + or - 0.2, (m-M)0 = 19.7 + or - 0.3 for E(B-V) = 0.02 + or - 0.02, no significant population of stars younger than 12 Gyr, central V surface brightness 17.2 + or - 0.5 mag/sq arcmin, integrated apparent V magnitude 10.3 + or - 0.7 mag, and overabundance 0.4-0.7 dex (compared to other Galactic dwarf spheroidals).

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