The main-sequence turnoff of the Draco dwarf galaxy

Details The main-sequence turnoff of the Draco dwarf galaxy The main-sequence turnoff of the Draco dwarf galaxy

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..908s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Oct. 1985, p. 908-923.

Astronomy and Astrophysics

Astronomy

29

Dwarf Galaxies, Local Group (Astronomy), Main Sequence Stars, Astronomical Photometry, Color-Magnitude Diagram

Scientific paper

Deep photometry on the B, V system for 182 stars in the dwarf spheroidal galaxy in Draco has been obtained with an RCA CCD camera at the Cassegrain focus of the Canada-France-Hawaii 3.6 m telescope. The best frames reach limiting magnitudes Vlim ≡ 24.5, Blim ≡ 25 mag. Draco's main-sequence turnoff is found near Vto ≡ 23.5, which is about 3.4 magnitudes below the galaxy's horizontal branch. This fact, plus fits of Draco's principal sequences to those of the fiducial globular clusters M3 and M92, to those of the dwarf spheroidal galaxy in Ursa Minor, and to theoretical isochrones, all argue that Draco is not measurably younger than the clusters or Ursa Minor: age(Draco) ≡ 18 Gyr according to current star-evolution chronologies.

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