Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85.1468z&link_type=abstract
Astronomical Journal, vol. 85, Nov. 1980, p. 1468-1479.
Astronomy and Astrophysics
Astronomy
13
Abundance, Astronomical Photometry, Elliptical Galaxies, Metals, Red Giant Stars, Visual Photometry, Color-Magnitude Diagram, Globular Clusters, Hertzsprung-Russell Diagram, Interstellar Extinction, Optical Scanners, Radiant Flux Density
Scientific paper
The paper examines the evidence of a range in metal abundance in the Draco dwarf spheroidal galaxy. It is shown that (1) Zinn's scanner observations of 17 red giants in Draco provide strong evidence of a significant dispersion in metallicity; (2) the scatter in B-V color of the subgiant branch stars in Stetson's color-magnitude diagram is consistent with the dispersion in metallicity that is inferred from Zinn's observations, but the possibility that the errors in the measurements alone are responsible for the scatter cannot be ruled out, and (3) the scatter in B-V of a brighter sample of red giants is also consistent with Zinn's observations, with the scatter clearly larger than that expected from the observational errors. It is concluded that there is no evidence against a dispersion in metallicity in Draco and that there is substantial evidence in favor of this hypothesis.
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