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Chemical abundances in main-sequence stars in open cluster M67
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
2011 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The discovery of a solar twin in the open star cluster M67 (Önehag et al. 2011) implies a near-solar chemical composition for the cluster. This study uses high-resolution spectroscopic data of five main-sequence stars in M67 to analyze their abundance of a few key elements and compare results to the solar-twin composition and the composition of field twins (Melendez et al. 2009). The derived composition was also compared to predictions of stellar-structure models including the effects of  element diffusion. (Richard, private communication).  It is found that all analyzed elements are, to varying degree, less abundant in the five main sequence stars than in the solar twin. With the possible exception of iron, all derived abundances also fall clearly below the diffusion predictions.

Place, publisher, year, edition, pages
2011. , 37 p.
Keyword [en]
Chemical abundance, Diffusion, Solar Twin, M67, Spectroscopy
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-169017OAI: diva2:505232
Physics, Chemistry, Mathematics
Available from: 2012-03-01 Created: 2012-02-21 Last updated: 2012-10-19Bibliographically approved

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