SIMBAD references

2004A&A...413..159A - Astronomy and Astrophysics, volume 413, 159-172 (2004/1-1)

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


Abstract (from CDS):

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., 2002A&A...392..491A]; Luck et al. (2003A&A...401..939L) 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 10-11kpc (assuming galactocentric distance of the Sun RG,☉=7.9kpc). Within the transition zone from 10 to 11kpc the relative-to-solar iron abundance decreases approximately to -0.2dex. 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≃11kpc can be interpreted as a change of metallicity level in the vicinity of the galactic corotation resonance.

Abstract Copyright:

Journal keyword(s): stars: abundances - Galaxy: abundances - Galaxy: evolution - stars: variables: cepheids

VizieR on-line data: <Available at CDS (J/A+A/413/159): stars.dat tablea1.dat tablea1.tex>

Status at CDS:  

Simbad objects: 15

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