Journal Article

High-resolution elemental abundance analysis of the open cluster IC 4756

Yuan-Sen Ting, Gayandhi M. De Silva, Kenneth C. Freeman and Stacey-Jo Parker

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 1, pages 882-892
Published in print November 2012 | ISSN: 0035-8711
Published online November 2012 | e-ISSN: 1365-2966 | DOI:
High-resolution elemental abundance analysis of the open cluster IC 4756

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We present detailed elemental abundances of 12 subgiants in the open cluster IC 4756 including Na, Al, Mg, Si, Ca, Ti, Cr, Ni, Fe, Zn and Ba. We measure the cluster to have [Fe/H] = −0.01 ± 0.10. Most of the measured star-to-star [X/H] abundance variation is below σ < 0.03, as expected from a coeval stellar population preserving natal abundance patterns, supporting the use of elemental abundances as a probe to reconstruct dispersed clusters. We find discrepancies between Cr i and Cr ii abundances as well as between Ti i and Ti ii abundances, where the ionized abundances are larger by about 0.2 dex. This follows other such studies which demonstrate the effects of overionization in cool stars. IC 4756 are supersolar in Mg, Si, Na and Al, but are solar in the other elements. The fact that IC 4756 is supersolar in some α-elements (Mg, Si) but solar in the others (Ca, Ti) suggests that the production of α-elements is not simply one dimensional and could be exploited for chemical tagging.

Keywords: stars: abundances; ISM: abundances; ISM: evolution

Journal Article.  4472 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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