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Title:
ARP 2 and Terzan 8: a Detailed Chemical Analysis
Authors:
Mottini, Marta; Wallerstein, George; McWilliam, Andrew
Affiliation:
AA(Astronomy Department, University of Washington, Seattle, WA 98195, USA ), AB(Astronomy Department, University of Washington, Seattle, WA 98195, USA ), AC(The Observatories of the Carnegie Institution of Washington, Pasadena, CA 91101, USA )
Publication:
The Astronomical Journal, Volume 136, Issue 2, pp. 614-620 (2008). (AJ Homepage)
Publication Date:
08/2008
Origin:
IOP
AJ Keywords:
globular clusters: general, globular clusters: individual: Arp 2 Terzan 8
DOI:
10.1088/0004-6256/136/2/614
Bibliographic Code:
2008AJ....136..614M

Abstract

To compare the globular clusters (GCs) associated with the Sagittarius Galaxy (Sgr) we report the results obtained from new high-resolution spectra of red giant stars in Terzan 8 and Arp 2, collected with the Magellan Inamori Kyocera Echelle (MIKE) spectrograph at Las Campanas Observatory. For Ter 8 we find [Fe I/H] = -2.37 ± 0.04 and [Fe II/H] = -2.30 ± 0.07, while for Arp 2 [Fe I/H] = -1.77 ± 0.04 and [Fe II/H] = -1.89 ± 0.07. Other elements, usually of interest, show the following results. For oxygen, we obtain [O/Fe] = 0.71 ± 0.17 for Ter 8 and [O/Fe] = 0.21 ± 0.22 for Arp 2. For the α-elements (Mg, Si, Ca, Ti), the mean values are 0farcs37 ± 0.14 dex for Ter 8 and 0.31 ± 0.11 for Arp 2. These values are not too different from the Galactic GCs at a similar [Fe/H] value. Regarding Cu, we find quite underabundant results for both clusters: [Cu/Fe] = -0.96 for Ter 8 and [Cu/Fe] = -0.93 for Arp 2. The heavy s-process elements Ba and Nd show no excesses in Ter 8 and Arp 2. Our only r-process element, Eu, shows an excess of 0.45 dex in Arp 2, based on the only useful line at 6645 Å.
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