Are the Bulge C-stars related to the Sagittarius dwarf galaxy? II. Metallicity -- a link with the Galactic disc

Details Are the Bulge C-stars related to the Sagittarius dwarf galaxy? II. Metallicity -- a link with the Galactic disc Are the Bulge C-stars related to the Sagittarius dwarf galaxy? II. Metallicity -- a link with the Galactic disc

1998-08-07

arxiv.org/abs/astro-ph/9808067v1

Astronomy and Astrophysics

Astrophysics

7 pages LaTeX, 4 figures, accepted for publication in A&A Main Journal

Scientific paper

The photometric estimate of the metallicity and the age of the Azzopardi et al. (1991, A&AS 88, 265) carbon stars (Ng 1997, A&A 328, 211) is revised to respectively Z~0.004 and ~0.1 Gyr. Under the hypothesis that the carbon stars are located at a distance related to the Sagittarius dwarf galaxy, the broad velocity dispersion of the stars can only be explained if they were formed out of Galactic material during a recent crossing of the Sagittarius dwarf galaxy through the Galactic plane.

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