期刊
ASTRONOMICAL JOURNAL
卷 137, 期 6, 页码 4753-4765出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/137/6/4753
关键词
Galaxy: abundances; open clusters and associations: individual (NGC 1817, NGC 1883, NGC 2141, NGC 2158); stars: abundances
资金
- National Science Foundation
- Daniel Kirkwood Research Fund at Indiana University
- National Aeronautics and Space Administration
We present an analysis of high-dispersion echelle spectra of seven giant stars in the similar to 1-2 Gyr old open clusters NGC 1817, NGC 1883, NGC 2141, and NGC 2158. Abundances were determined relative to the bright, mildly metal-poor disk giant Arcturus. NGC 1817, NGC 1883, NGC 2141, and NGC 2158 are found to have a mean [Fe/H] = -0.07 +/- 0.04, -0.01 +/- 0.01, +0.00 +/- 0.16, and -0.03 +/- 0.14 (s.d.), respectively. All four clusters show modest (similar to 0.1 dex) enhancements of Na and Si, and scaled solar abundances of Al and Mg, while [O/Fe] similar to -0.15 dex. [Ca/Fe] and [Ti/Fe] values are slightly subsolar in all four clusters, but this may be due to a systematic effect. Given that all four of these clusters are located at R-gc > 10 kpc in the disk, and barring any systematic effects, our results imply that any abrupt transition in abundance in the Galactic disk occurs beyond R-gc similar to 13 kpc.
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