The Carina dwarf spheroidal - an old galaxy with a large intermediate age population

Details The Carina dwarf spheroidal - an old galaxy with a large intermediate age population The Carina dwarf spheroidal - an old galaxy with a large intermediate age population

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26as...82....1m&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 82, no. 1, Jan. 1990, p. 1-39. Research supported by ZWO and

Astronomy and Astrophysics

Astrophysics

58

Astronomical Photometry, Dwarf Galaxies, Galactic Evolution, Star Formation Rate, Stellar Evolution, Visual Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Metallicity, Protostars, Spectrophotometry, Spheroids, Tables (Data)

Scientific paper

Deep V R CCD photometry of the Carina dwarf spheroidal galaxy is presented. The resulting C-M diagram reaches V = 25.0 mag and clearly shows the existence of an old stellar population whose existence was predicted by the presence of RR Lyraes in the galaxy. Mould and Aaronson's (1983) finding that most of the stars in Carina belong to an intermediate-age (7.5 + or - 1.5 Gyr) population is confirmed. The old population is 17 + or - 4 percent of the total stellar population. The old population is 13.1 + or - 2.2 Gyr old. The ancient population of the Carina dwarf spheroidal galaxy probably formed in a short burst of star formation about 13-16 Gyr ago. The rate of star formation then probably became negligibly small for the next 6-8 Gyr. About 6-9 Gyr ago, the rate of star formation dramatically increased, and almost all of the remaining protostellar material was converted into stars in the burst of star formation that created the dominant intermediate-age population.

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