Fig. 5
Teff – log g diagram of solar twin stars in comparison with Yonsei-Yale isochrones corresponding to ages given to the right in Gyr. The isochrones refer to [Fe/H] = 0.0 and [α/Fe] = 0.0, but 5 Gyr isochrones corresponding to [ Fe/H ] = −0.05 (dashed line) and [ α/Fe ] = + 0.1 (dotted line) are also shown. The position of the Sun with an age of 4.55 Gyr is marked.
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