Differential asteroseismic study of seismic twins observed by CoRoT
Résumé
Context. The CoRoT short asteroseismic runs give us the opportunity to
observe a large variety of late-type stars through their solar-like oscillations. We
report the observation and modeling of the F5V star HD 175272.Aims. Our aim is to define a method for extracting as much information
as possible from a noisy oscillation spectrum. Methods. We followed a differential approach that consists of using a
well-known star as a reference to characterize another star. We used classical tools such
as the envelope autocorrelation function to derive the global seismic parameters of the
star. We compared HD 175272 with HD 181420 through a linear approach, because they appear
to be asteroseismic twins.Results. The comparison with the reference star enables us to
substantially enhance the scientific output for HD 175272. First, we determined its global
characteristics through a detailed seismic analysis of HD 181420. Second, with our
differential approach, we measured the difference of mass, radius and age between
HD 175272 and HD 181420.Conclusions. We have developed a general method able to derive
asteroseismic constraints on a star even in case of low-quality data. This method can be
applied to stars with interesting properties but low signal-to-noise ratio oscillation
spectrum, such as stars hosting an exoplanet or members of a binary system.
Origine : Publication financée par une institution
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