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Chemical composition of clump stars in the open cluster NGC 6134★: Chemical composition of clump stars in NGC 6134

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Mikolaitis, Šarūnas, Tautvaišienė, Gražina, Gratton, Raffaele, Bragaglia, Angela, Carretta, Eugenio·2010·Monthly Notices of the Royal Astronomical Society
DOI 10.1111/j.1365-2966.2010.17030.x
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Abstract

We present an analysis of high-resolution spectra of six core-helium-burning ‘clump’ stars in the open cluster NGC 6134. Atmospheric parameters (Teff, log g, vt and [Fe/H]) were determined in our previous study by Carretta et al. (2004). In this study we present abundances of C, N, O and up to 24 other chemical elements. Abundances of carbon were derived using the C2 Swan (0,1) band head at 5635.5 Å (FEROS spectra) and the C2 Swan (1,0) band head at 4737 Å (UVES spectra). The wavelength interval 7980–8130 Å, with strong CN features, was analysed in order to determine nitrogen abundances and 12C/13C isotope ratios. The oxygen abundances were determined from the [O i] line at 6300 Å. Compared to the Sun and other dwarf stars of the Galactic disc, mean abundances in the investigated clump stars suggest that carbon is depleted by about 0.2 dex, nitrogen is overabundant by about 0.3 dex and oxygen is underabundant by about 0.1 dex. This has the effect of lowering the mean C/N ratio to 1.2 ± 0.2. The mean 12C/13C ratios are lowered to 9 ± 2.5. Concerning other chemical elements, the analysis of sodium and magnesium lines, lines of other α-elements, iron-group and heavier chemical elements gave abundance ratios close to the solar ones.

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  • Observations of the 12C/13C ratio in open metal-rich clusters reveal values of ≲20, sometimes ≲10, well below the predicted values of ≈25-30.

    “observations of the 12 C/ 13 C ratio in open metal-rich clusters reveal values of ≲ 20, sometimes ≲ 10(e.g., Gilroy 1989; Smiljanic et al. 2009; Mikolaitis et al. 2010) well below the predicted values of ≈ 25 -30.”

    From The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014) · cites this paper as Mikolaitis et al. 2010

    Section 3.3 reports a mean ¹²C/¹³C ratio of 9 ± 2.5 in NGC 6134 clump stars and says clump-star ratios in open clusters are well below first-dredge-up predictions. Section 3.6 also reports a ratio of 16 ± 4 for M 67 clump stars. The copy does not give the predicted range as approximately 25–30, so that numerical part of the claim is not established by this source. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

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Metadata

Authors
Mikolaitis, Š., Tautvaišienė, G., Gratton, R., Bragaglia, A., & Carretta, E.
Affiliations
  • Vilnius University (LT)
  • Osservatorio Astronomico di Padova (IT)
  • Osservatorio astronomico di Bologna (IT)
ORCID
Venue
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Published
2010-07-15
Volume
407
Issue
3
Pages
1866-1874
ISSN
0035-8711 (ISSN-L)
DOI
10.1111/j.1365-2966.2010.17030.x
OpenAlex
W2119170953
Cited by
53
References
0
Citations by year
2025: 2 · 2024: 1 · 2023: 2 · 2022: 1 · 2019: 1 · 2018: 4 · 2017: 3 · 2016: 9 · 2015: 4 · 2014: 6 · 2013: 4 · 2012: 4
FWCI
3.58
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • HighWire Press Open Archive (submittedVersion)
  • arXiv (Cornell University)
Funders
European Commission
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Keywords
open clusters, chemical abundances, carbon depletion, nitrogen surplus, C/N ratio, 13C/12C isotope ratio, alpha elements, iron group elements, dwarf stars

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