Journal Article

Spectroscopy of red giants in the open clusters NGC 1545 and Tr2

L. Začs, O. Alksnis, A. Barzdis, A. Laure, F. A. Musaev, A. Bondar and J. Sperauskas

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 417, issue 1, pages 649-658
Published in print October 2011 | ISSN: 0035-8711
Published online October 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19309.x
Spectroscopy of red giants in the open clusters NGC 1545 and Tr2

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The results of local thermodynamic equilibrium (LTE) abundance analysis are presented for four red giants in the fields of open clusters NGC 1545 and Tr2. The membership of HD 27276, HD 27292 and HD 16068 was confirmed and the age of NGC 1545 was updated: log age(yr) = 7.95. A mild deficiency of iron-group elements was found on average for NGC 1545 and Tr2, [Fe/H]=−0.13 and −0.07 with an uncertainty of about 0.08 dex. Oxygen and carbon are moderately depleted in all cluster giants, [O/Fe]=−0.23 ± 0.05 dex and [C/Fe]=−0.56 ± 0.07 dex on average. Nitrogen is enhanced, [N/Fe] values in range +0.4 to +1.2 dex, and lithium depleted. Sodium is slightly enhanced, [Na/Fe]=+0.26 ± 0.04 dex on average. Modified abundances are in agreement with the chemical evolution of intermediate-mass stars on the red giant branch. Some occasional radial velocity variations are probably due to convection in the atmospheres of luminous giants.

Keywords: stars: abundances; stars: fundamental parameters; stars: late-type; open clusters and associations: individual: NGC 1545; open clusters and associations: individual: Tr2

Journal Article.  5803 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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