English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Asteroseismology provides a powerful way to constrain stellar parameters.Solar-like oscillations have been observed on subgiant stars with the\emph{Kepler\/} mission. The continuous and high-precision time series enablesus to carry out a detailed asteroseismic study for these stars. We carry outdata processing of two subgiants of spectral type G: KIC 6442183 and KIC11137075 observed with the \emph{Kepler} mission, and perform seismic analysisfor the two evolved stars. We estimate the values of global asteroseismicparameters: $\Delta\nu=64.9\pm 0.2 $ $\mu$Hz and $\nu_{\rm max}=1225 \pm 17$$\mu$Hz for KIC 6442183, $\Delta\nu=65.5\pm 0.2 $ $\mu$Hz and $\nu_{\rmmax}=1171 \pm 8$ $\mu$Hz for KIC 11137075, respectively. In addition, weextract the individual mode frequencies of the two stars. We compare stellarmodels and observations, including mode frequencies and mode inertias. The modeinertias of mixed modes, which are sensitive to the stellar interior, are usedto constrain stellar models. We define a quantity $d\nu_{\rm m-p}$ thatmeasures the difference between the mixed modes and the expected pure pressuremodes, which is related to the inertia ratio of mixed modes to radial modes.Asteroseismic together with spectroscopic constraints provide the estimationsof the stellar parameters: $M = 1.04_{-0.04}^{+0.01} M_{\odot}$, $R =1.66_{-0.02}^{+0.01} R_{\odot}$ and $t=8.65_{-0.06}^{+1.12}$ Gyr for KIC6442183, and $M = 1.00_{-0.01}^{+0.01} M_{\odot}$, $R = 1.63_{-0.01}^{+0.01}R_{\odot}$ and $t=10.36_{-0.20}^{+0.01}$ Gyr for KIC 11137075. Either modeinertias or $d\nu_{\rm m-p}$ could be used to constrain stellar models.

Asteroseismic analysis of solar-mass subgiants KIC 6442183 and KIC 11137075 observed by Kepler