Main-sequence turnoff of the Draco dwarf galaxy

Journal Article · Tue Oct 01 04:00:00 EDT 1985 · Publ. Astron. Soc. Pac.; (United States)

DOI:https://doi.org/10.1086/131644· OSTI ID:5882081

Stetson, P B; Mcclure, R D; Vandenberg, D A

Deep photometry on the B,V system for 182 stars in the dwarf spheroidal galaxy in Draco was obtained with a CCD camera at the Cassegrain focus of the Canada-France-Hawaii 3.6-m telescope. Draco's main-sequence turnoff if found near V(to) = 23.5, which is about 3.4 magnitudes below the galaxy's horizontal branch. This leads to the interpretation that Draco is not measurably younger than the clusters or Ursa Minor: the age of Draco is about 18 Gyr according to current star-revolution chronologies. No blue stragglers are definitely detected in Draco, and it is concluded that any young population in Draco probably represents less than 10 percent of the total. 30 references.

• Research Organization: Dominion Astrophysical Observatory, Victoria, Canada; Victoria Univ., Canada
• OSTI ID: 5882081
• Journal Information: Publ. Astron. Soc. Pac.; (United States), Journal Name: Publ. Astron. Soc. Pac.; (United States) Vol. 97; ISSN PASPA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AGE ESTIMATION
DATA
GALAXIES
INFORMATION
MAIN SEQUENCE STARS
NUMERICAL DATA
STAR CLUSTERS
STARS
THEORETICAL DATA