Journal Article

Comprehensive abundance analysis of red giants in the open clusters NGC 752, 1817, 2360 and 2506

Arumalla B. S. Reddy, Sunetra Giridhar and David L. Lambert

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 2, pages 1350-1361
Published in print January 2012 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19791.x
Comprehensive abundance analysis of red giants in the open clusters NGC 752, 1817, 2360 and 2506

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We have analysed high-dispersion echelle spectra (R ≳ 50 000) of red giant members for four open clusters to derive abundances for many elements. The spread in temperatures and gravities being very small among the red giants nearly the same stellar lines were employed thereby reducing the random errors. The errors of average abundance for the cluster were generally in the range 0.02–0.07 dex. Our present sample covers Galactocentric distances of 8.3–10.5 kpc. The [Fe/H] values are −0.02 ± 0.05 for NGC 752, −0.07 ± 0.06 for NGC 2360, −0.11 ± 0.05 for NGC 1817 and −0.19 ± 0.06 for NGC 2506. Abundances relative to Fe for elements from Na to Eu are equal within measurement uncertainties to published abundances for thin-disc giants in the field. This supports the view that field stars come from disrupted open clusters.

Keywords: stars: abundances; Galaxy: abundances; open clusters and associations: individual: NGC 752; open clusters and associations: individual: NGC 1817; open clusters and associations: individual: NGC 2360; open clusters and associations: individual: NGC 2506

Journal Article.  6009 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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