Deep CCD photometry of the Sextans dwarf spheroidal galaxy

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115734· OSTI ID:5701312

Mateo, M; Nemec, J; Irwin, M; Mcmahon, R ^[1]

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1. Observatories of the Carnegie Institution, Pasadena, CA (USA) British Columbia Univ., Vancouver (Canada) Cambridge Univ. (England)

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). 66 refs.

• OSTI ID: 5701312
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 101; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHEMICAL COMPOSITION
CONFIGURATION
DATA
DIAGRAMS
DISTRIBUTION
ELLIPTICAL CONFIGURATION
GALACTIC EVOLUTION
GALAXIES
GIANT STARS
HERTZSPRUNG-RUSSELL DIAGRAM
INFORMATION
PHOTOMETRY
POPULATIONS
RED GIANT STARS
SPATIAL DISTRIBUTION
STAR EVOLUTION
STARS