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New solar twins and the metallicity and temperature scales of the Geneva–Copenhagen Survey†
Article first published online: 18 SEP 2012
DOI: 10.1111/j.1365-2966.2012.21730.x
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Issue
Monthly Notices of the Royal Astronomical Society
Volume 426, Issue 1, pages 484–495, 11 October 2012
Additional Information
How to Cite
Datson, J., Flynn, C. and Portinari, L. (2012), New solar twins and the metallicity and temperature scales of the Geneva–Copenhagen Survey. Monthly Notices of the Royal Astronomical Society, 426: 484–495. doi: 10.1111/j.1365-2966.2012.21730.x
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Publication History
- Issue published online: 11 SEP 2012
- Article first published online: 18 SEP 2012
- Manuscript Accepted: 16 JUL 2012
- Manuscript Received: 2 JUL 2012
Funded by
- Academy of Finland. Grant Numbers: 130951, 218317
- Beckwith Trust
- Abstract
- Article
- References
- Cited By
Keywords:
- stars: abundances;
- stars: fundamental parameters;
- stars: solar-type
ABSTRACT
We search for ‘solar twins’ in the Geneva–Copenhagen Survey (GCS) using high-resolution optical spectroscopy. We initially select Sun-like stars from the GCS by absolute magnitude, (b − y) colour and metallicity close to the solar values. Our aim is to find the stars which are spectroscopically very close to the Sun using line depth ratios and the median equivalent widths and depths of selected lines with a range of excitation potentials. We present the 10 best stars fulfilling combined photometric and spectroscopic criteria, of which six are new twins. We use our full sample of Sun-like stars to examine the calibration of the metallicity and temperature scale in the GCS. Our results give rise to the conclusion that the GCS may be offset from the solar temperature and metallicity for Sun-like stars by 100 K and 0.1 dex, respectively.