A1 Refereed original research article in a scientific journal
New solar twins and the metallicity and temperature scales of the Geneva-Copenhagen Survey
Authors: Datson J, Flynn C, Portinari L
Publisher: WILEY-BLACKWELL
Publication year: 2012
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Number in series: 1
Volume: 426
Issue: 1
First page : 484
Last page: 495
Number of pages: 12
ISSN: 0035-8711
DOI: https://doi.org/10.1111/j.1365-2966.2012.21730.x
Abstract
We search for solar twins in the GenevaCopenhagen 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.
We search for solar twins in the GenevaCopenhagen 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.
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