A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
New solar twins and the metallicity and temperature scales of the Geneva-Copenhagen Survey
Tekijät: Datson J, Flynn C, Portinari L
Kustantaja: WILEY-BLACKWELL
Julkaisuvuosi: 2012
Journal: Monthly Notices of the Royal Astronomical Society
Tietokannassa oleva lehden nimi: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Lehden akronyymi: MON NOT R ASTRON SOC
Numero sarjassa: 1
Vuosikerta: 426
Numero: 1
Aloitussivu: 484
Lopetussivu: 495
Sivujen määrä: 12
ISSN: 0035-8711
DOI: https://doi.org/10.1111/j.1365-2966.2012.21730.x
Tiivistelmä
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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