The Galactic abundance gradient from Cepheids. V. Transition zone between 10 and 11 kpc

Details The Galactic abundance gradient from Cepheids. V. Transition zone between 10 and 11 kpc The Galactic abundance gradient from Cepheids. V. Transition zone between 10 and 11 kpc

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...413..159a&link_type=abstract

Astronomy and Astrophysics, v.413, p.159-172 (2004)

Astronomy and Astrophysics

Astrophysics

109

Stars: Abundances, Galaxy: Abundances, Galaxy: Evolution, Stars: Variables: Cepheids

Scientific paper

This paper reports on the spectroscopic investigation of 12 Cepheids which are situated in the crucial region of galactocentric distances from 9 kpc to 12 kpc, where according to our previous results (Andrievsky et al. \cite{andret02c}; Luck et al. \cite{lucket03}) the radial metallicity distribution experiences an obvious change. In particular, the wriggle in the iron abundance distribution is found to fall approximately at galactocentric distances 10-11 kpc (assuming galactocentric distance of the Sun RG, &sun; = 7.9 kpc). Within the transition zone from 10 to 11 kpc the relative-to-solar iron abundance decreases approximately to -0.2 dex. The new sample of stars, analyzed in present paper, gives results supporting the previous conclusion about the multimodal character of the metallicity distribution in galactic disc. Using a quite simple consideration of galactic chemical evolution we show that the observed distribution can be explained in the framework of a model which includes the spiral arms. In particular, the wriggle feature associated with RG ≈ 11 kpc can be interpreted as a change of metallicity level in the vicinity of the galactic corotation resonance.
Based on spectra collected at the 3.6-m Canada-France-Hawaii Telescope.
Table A1 (Appendix) is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/413/159

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