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Chemical abundances in bright giants of the globular cluster M62 (NGC 6266)

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Chemical abundances in bright giants of the globular cluster M62 (NGC 6266)

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Título Chemical abundances in bright giants of the globular cluster M62 (NGC 6266)
Autor Yong, David
Brito, Alan Alves
Da Costa, Gary Stewart
Alonso Garcia, Javier
Karakas, Amanda I.
Pignatari, Marco
Roederer, Ian U.
Aoki, Wako
Fishlock, Cherie K.
Grundahl, Frank
Norris, John E.
Abstract With the exception of Terzan 5, all the Galactic globular clusters that possess significant metallicity spreads, such as ω Cen and M22, are preferentially the more luminous clusters with extended horizontal branches. Here we present radial velocities and chemical abundances for seven bright giants in the globular cluster M62, a previously little-studied cluster. With MV = −9.18, M62 is the ninth most luminous Galactic globular cluster and has an extended horizontal branch. Within our sample, we find (i) no evidence for a dispersion in metallicity, [Fe/H], beyond the measurement uncertainties, (ii) star-to-star abundance variations for C, O, Na and Al with the usual correlations between these elements as seen in other globular clusters, and (iii) a global enrichment for the elements Zr, Ba and La at the level [X/Fe] − ~ +0.4 dex. For elements heavier than La, the abundance ratios are consistent with the scaled-solar r-process distribution. Below La, the abundances are anomalous when compared to the scaled-solar s-process or r-process distributions. For these elements, the abundance signature in M62 is in agreement with predictions of the s-process from fast-rotating massive stars, although the high [Rb/Y] ratio we measure may be a challenge to this scenario.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 439, no. 3 (Apr. 2014), p. 2638-2650
Assunto Aglomerados estelares globulares
Composicao estelar
Estrelas gigantes
Massa estelar
Rotacao estelar
[en] Galaxy: abundances
[en] Globular clusters: individual: NGC 6266
[en] Stars: abundances
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/103450
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