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| Paper: |
Manganese Abundances in Globular Cluster and Halo Field Stars |
| Volume: |
336, COSMIC ABUNDANCES as Records of Stellar Evolution and Nucleosynthesis in honor of David L. Lambert |
| Page: |
363 |
| Authors: |
Sobeck, J.S.; Simmerer, J.A.; Fulbright, J.P.; Sneden, C.; Kraft, R.P.; Ivans, I.I. |
| Abstract: |
We have derived Mn abundances for more than 100 stars in eleven Galactic globular clusters: M3 (NGC 5272), M4 (NGC 6121), M5 (NGC 5904), M10 (NGC 6254), M13 (NGC 6205), M15 (NGC 7078), M71 (6838), M92 (6341), Pal5, Pal 12 and NGC 7006. In addition, Mn abundance determinations have been made for a comparable number of halo field stars possessing an overlapping range of metallicities and stellar parameters. Data were collected at the McDonald, Lick and Keck Observatories and were analyzed using synthetic spectra of the 6000 Å Mn I triplet. Hyperfine structure parameters were included in the synthetic spectra computations. Our analysis shows that for the metallicity range −0.8 > [Fe/H] > −2.7 field stars have a mean relative abundance of <[Mn/Fe]> = −0.27±0.01 (σ = 0.08), a value essentially identical to that of the eleven globular clusters:
<[Mn/Fe]> = −0.28±0.01 (σ = 0.12). Our Mn abundance results viewed in conjunction with the globular cluster Cu abundances of Simmerer et al. (2003) suggest the following possibilities: one, the production of these elements is extremely metallicity-dependent or two, these elements were manufactured in the Galactic halo prior to cluster formation. |
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