Estimating the p-mode frequencies of the solar twin 18 Scorpii

摘要: Solar twins have been a focus of attention for more than decade, because their structure is extremely close to that the Sun. Today, thanks high-precision spectrometers, it possible use asteroseismology probe interiors. Our goal time series obtained from HARPS spectrometer extract oscillation frequencies 18 Sco, brightest solar twin. We used tools spectral analysis estimate these quantities. 52 using an MCMC algorithm. After examination probability densities and comparison with results direct MAP optimization, we obtain minimal set 21 reliable modes. The identification each pulsation mode straightforwardly accomplished by comparing well-established also derived some basic seismic indicators values. These offer good basis start detailed Sco stellar models.