Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..396...73j&link_type=abstract
Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Recent studies of the radial abundance distribution among stellar populations in the Galactic disk have shown a change in the abundance trend at galactocentric distance R_{GC}˜10 kpc, as first noted by Twarog et al. (1997). Here the gradient in [Fe/H] with distance appears to vanish, with abundances of stars at greater distances dropping to [Fe/H]˜-0.5, independent of galactocentric distance. Also, [α/Fe]>0 for R_{gc}>10 kpc, contrasted to the solar ratios exhibited by clusters interior to 10 kpc (Yong et al. 2005). This implies that the outer disk has undergone a different star formation history than the inner disk. However, abundances of many more stars at R_{GC}˜9-12 kpc must be determined to characterize the nature of the transition from inner to outer disk. To that end, we have initiated a spectroscopic survey of a large sample of open clusters in this region, which we describe here.
Friel Eileen D.
Jacobson Heather R.
Pilachowski Catherine A.
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