Abstract
A new sample of solar analogs and twin candidates have been constructed and studied, with particular attention to their light curves from NASA's Kepler mission. This letter aims to assess the evolutionary status, derive their rotation and ages and identify those solar analogs or solar twin candidates. We separate out the subgiants that compose a large fraction of the asteroseismic sample, and which show an increase in the average rotation period as the stars ascend the subgiant branch. The rotation periods of the dwarfs, ranging from 6 to 30 days, and averaged 19d, allow us to assess their individual evolutionary states on the main sequence, and to derive their ages using gyrochronology. These ages are found to be in agreement with a correlation coefficient of r = 0.79 with the independent asteroseismic ages, where available. As a result of this investigation, we are able to identify 34 stars as solar analogs and 22 of them as solar twin candidates.
Highlights
The Sun is a benchmark in stellar astrophysics research and establishing a sample of solar analog stars is important to map its past, present, and future
Our sample of 75 stars consists of a seismic sample of 38 from Chaplin et al (2014), 35 additional stars selected from the Kepler Input Catalog (KIC), and 16 Cyg A and B
We report rotation periods for 30 subgiants and 43 dwarfs, where 34 are main-sequence stars with 0.90 M/M 1.10
Summary
The Sun is a benchmark in stellar astrophysics research and establishing a sample of solar analog stars is important to map its past, present, and future. Solar twins are spectroscopically indistinguishable from the Sun (Cayrel de Strobel 1996), for example, 18 Sco (Porto de Mello & da Silva 1997; Bazot et al 2011), CoRoT Sol 1 (do Nascimento et al 2013), and HIP 102152 (Monroe et al 2013). Recent works have increased the number of solar twins and studied their physical parameters and chemical abundances in detail, their Prot are mostly unknown, except for the two solar twins 18 Sco (Porto de Mello & da Silva 1997) and CoRoT Sol 1 (do Nascimento et al 2013)
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