Aims. We determine the age and mass of the three best solar twin candidates in open cluster M 67 through lithium evolutionary models. Methods. We computed a grid of evolutionary models with non-standard mixing at metallicity ...

We present detailed chemical abundance analyses of the oldest solar twin HIP 102152, with a derived age of 8.2 Gyr, and the younger 2.9 Gyr solar twin 18 Sco. We determined differential abundances of 21 elements relative ...

In this work we present differential chemical abundances of neutron-capture elements (Z >30) in solar twins. We have obtained high resolution (R = 60,000) and high S/N ( >100) spectra of solar twins in the ultraviolet ...

The study of solar-type stars also includes the familiar solar analogs and twins. These objects have been one of the major research subjects in astrophysics nowadays. A direct comparison of solar activity with chromospheric ...

A new sample of solar analogs and twin candidates has been constructed and studied, paying particular attention to their light curves from NASA’s Kepler mission. This Letter aims to assess their evolutionary status, derive ...

Context. The standard solar model fails to predict the very low lithium abundance in the Sun, which is much lower than the proto-solar nebula (as measured in meteorites). This Li problem has been debated for decades, and ...

We present preliminary results from an ongoing radial velocity planet search around solar twins using the HARPS spectrograph. By limiting our sample to stars with Teff +/- 100 K, log(g) +/- 0.1 dex, and [Fe/H] +/- 0.1 dex ...