Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5808a&link_type=abstract
American Astronomical Society, AAS Meeting #211, #58.08; Bulletin of the American Astronomical Society, Vol. 39, p.835
Astronomy and Astrophysics
Astronomy
Scientific paper
We have obtained spectra using the 4-meter telescope at Cerro Tololo InterAmerican Observatory and the Hydra multi-object echelle spectrograph in July of 2005 for stars in the intermediate-age open cluster NGC 3680. The targeted wavelength range, 6550 to 6800 Angstroms, was chosen to probe the lithium abundances of 72 stars including giants, turnoff stars and main sequence stars as faint as four magnitudes below the cluster turnoff; signal to noise ratios for the spectra vary from a few dozen to over 300 within the sample. Utilizing membership information from Kozhurina-Platais et al. (1995), we find the mean radial velocity for 24 cluster stars with membership probabilities > 50% and no indication of binarity to be 1.82 km/sec, similar to the value of 1.3 km/sec found by Nordstrom, Andersen & Andersen (1996). Our results confirm the dip in Lithium near the main sequence turnoff noted by Pasquini et al. (2001) and sketch out a declining lithium abundance for cooler main sequence stars. Further analyses appear to confirm a slightly subsolar iron abundance for the cluster.
Anthony-Twarog Barbara J.
Callen E. F.
Croxall Kevin V.
Cummings Jay
Deliyannis Constantine P.
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