A detailed spectroscopic analysis of the open cluster NGC 5460

Fossati, L.; Folsom, C. P.; Bagnulo, S.; Grunhut, J. H.; Kochukhov, O.; Landstreet, J. D.; Paladini, C. and Wade, G. A. (2011). A detailed spectroscopic analysis of the open cluster NGC 5460. Monthly Notices of the Royal Astronomical Society, 413(2) pp. 1132–1144.

DOI: https://doi.org/10.1111/j.1365-2966.2011.18199.x


Within the context of a large project aimed at studying early F-, A- and late B-type stars, we present the abundance analysis of the photospheres of 21 members of the open cluster NGC 5460, an intermediate-age cluster (log t˜ 8.2) previously not studied with spectroscopy. Our study is based on medium- and high-resolution spectra obtained with the Fibre Large Array Multi Element Spectrograph (FLAMES) instrument of the European Southern Observatory/Very Large Telescope. We show that cluster members have a nearly solar metallicity and that there is evidence that the abundances of magnesium and iron are correlated with the effective temperature, exhibiting a maximum around Teff= 10 500 K. No correlations are found between abundances and projected equatorial velocity, except for marginal evidence of barium being more abundant in slower than in faster rotating stars. We discovered two He-weak stars and a binary system where the hotter component is an HgMn star. We provide new estimates for the cluster distance (720 ± 50 pc), age (log t=8.2 ± 0.1) and mean radial velocity (-17.9 ± 5.2 km s-1).

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