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Abundances of four open clusters from solar stars

Show simple item record Pace, G. Pasquini, L. Francois, P. 2009-06-12T11:20:42Z 2009-06-12T11:20:42Z 2008
dc.description.abstract Aims. We present the abundance measurements of several elements (Fe, Ca, Na, Ni, Ti, Al, Cr, Si) for 20 solar-type stars belonging to four Galactic open clusters: NGC 3680, IC 4651, Praesepe, and M 67. Oxygen abundances were in addition measured for most stars in each cluster apart from IC 4651. For NGC 3680, accurate abundance determinations using high-resolution spectra covering a large spectral domain are computed for the first time. Methods. We used UVES high-resolution, high signal-to-noise (S/N) ratio spectra and performed a differential analysis with respect to the sun, by measuring equivalent widths and assuming LTE. Results. The most surprising result is a measurement of significant supersolar metallicity for Praesepe ([Fe/H] = 0.27 ± 0.10). As for the other clusters, we confirm a supersolar metallicity for IC 4651 ([Fe/H] = 0.12 ± 0.05), a solar metallicity for M 67 ([Fe/H] = 0.03 ± 0.04) and a slight subsolar metallicity for NGC 3680 ([Fe/H] = −0.04 ± 0.03). We find that the abundance ratios of almost all elements are solar, with the notable exception of oxygen in NGC 3680 and Praesepe, supersolar in the former cluster ([O/Fe] = 0.2 ± 0.05) and as low as [O/Fe] = −0.4 ± 0.1 in the latter. Observations of several objects per cluster is required to obtain robust results, especially for those elements with a limited number of suitable lines. en_US
dc.language.iso en_US en_US
dc.relation.ispartofseries aa489-403
dc.subject Stars: abundances – Galaxy: open clusters and associations: individual: NGC 3680 – Galaxy: open clusters ans associations: individual: IC 4651 – Galaxy: open clusters and associations: individual: Praesepe – Galaxy: open clusters and associations: individual: M 67 en_US
dc.title Abundances of four open clusters from solar stars en_US
dc.type Article en_US

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