Martin, AJ and Stift, MJ and Fossati, L and Bagnulo, S and Scalia, C and Leone, F and Smalley, B (2017) A spectroscopic study of the open cluster NGC 6250. Monthly Notices of the Royal Astronomical Society, 466 (1). 613 - 627. ISSN 1365-2966

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Abstract

We present the chemical abundance analysis of 19 upper main-sequence stars of the young open
cluster NGC 6250 (log t∼7.42 yr). Thiswork is part of a project aimed at setting observational
constraints on the theory of atomic diffusion in stellar photospheres, by means of a systematic
study of the abundances of the chemical elements of early F-, A- and late B-type stars of
well-determined age. Our data set consists of low-, medium- and high-resolution spectra obtained with the Fibre Large Array Multi Element Spectrograph (FLAMES) instrument of the ESO Very Large Telescope (VLT). To perform our analysis, we have developed a new suite of software tools for the chemical abundance analysis of stellar photospheres in local thermodynamical equilibrium. Together with the chemical composition of the stellar photospheres, we have provided new estimates of the cluster mean radial velocity, proper motion, refined the cluster membership, and we have given the stellar parameters including masses and fractional age. We find no evidence of statistically significant correlation between any of the parameters, including abundance and cluster age, except perhaps for an increase in Ba abundance with cluster age.We have proven that our new software tool may be successfully used for the chemical abundance analysis of large data sets of stellar spectra.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: stars, abundances, open clusters and associations, individual, NGC 6250
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 10 Jul 2017 09:40
Last Modified: 19 Sep 2017 10:28
URI: http://eprints.keele.ac.uk/id/eprint/3744

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