Using Cepheids to determine the galactic abundance gradient. III.First results for the outer disc
Abstract
As a continuation of our previous work, which concerned the radial abundance distribution in the galactic disc over the distances 4-10 kpc this paper presents the first results on the metallicicty in the outer disc (RG > 10 kpc). Based on high-resolution spectra obtained for 19 distant Cepheids we sampled galactocentric distances from 10 to 12 kpc. Combined with the results of our previous work on the inner and middle parts of the galactic disc, the present data enable one to study the structure of the radial abundance distribution over a large baseline. In particular, we find indications of a discontinuity in the radial abundance distribution for iron as well as a number of the other elements. The discontinuity is seen at a galactocentric distance RG = 10 kpc. This finding supports the results reported earlier by Twarog et al. (1997).
Keywords
Cite
@article{arxiv.astro-ph/0208056,
title = {Using Cepheids to determine the galactic abundance gradient. III.First results for the outer disc},
author = {S. M. Andrievsky and V. V. Kovtyukh and R. E. Luck and J. R. D. Lepine and W. J. Maciel and Yu. V. Beletsky},
journal= {arXiv preprint arXiv:astro-ph/0208056},
year = {2009}
}
Comments
18 pages, 5 encapsulated postscript figures, LaTeX, uses Astronomy and Astrophysics macro aa.cls, graphics package, to be published in Astronomy and Astrophysics (2002) Also available at: http://www.astro.iag.usp.br/~maciel