论文标题
DAV Star R808的星空学
Asteroseismology of the DAV star R808
论文作者
论文摘要
在2008年4月，在湿跑XCOV26上观察到13种不同的望远镜在170多个小时内观察到DAV星R808。通过此数据集确定了25个独立的脉动频率。我们假设了19 $ m $ = 0模式，并对这19个模式进行了一项星际学研究。我们通过\ texttt {wdec}来进化DAV星模型的网格，该{WDEC}采用了具有纯和筛选的库仑电势效应的元素扩散方案。核心成分来自\ texttt {mesa}演变的白色矮人模型，这些模型是热核燃烧结果。我们最好的拟合模型来自筛选的库仑电势场景，该场景具有log的参数（$ m _ {\ rm He}/m _ {\ rm *} $）= -2.4，log（$ m _ {\ rm h}/m h}/m _ $ m _ {\ rm *} $ = 0.710 \，$ m _ {\ odot} $，log $ g $ = 8.194和$σ_{rms} $ = 2.86 \，s。 $σ_{rms} $的值是四个现有的小型学学工作中最小的值。平均周期间距为46.299 \，s $ l $ = 1模式和25.647 \，s $ l $ = 2模式。其他6个观察到的模式可以由$ m $ $ $ \ neq $ 0组件的某些模式组件拟合，以适应我们的最佳拟合模式。拟合25个观察到的模式，我们获得了$σ_{rms} $值为2.59 \，s。考虑到周期间距，我们还假设至少在一种情况下，我们检测到$ l $ = 2被困模式。
The DAV star R808 was observed by 13 different telescopes for more than 170 hours in April 2008 on the WET run XCOV26. 25 independent pulsation frequencies were identified by this data set. We assumed 19 $m$ = 0 modes and performed an asteroseismological study on those 19 modes. We evolve grids of DAV star models by \texttt{WDEC} adopting the element diffusion scheme with pure and screened Coulomb potential effect. The core compositions are from white dwarf models evolved by \texttt{MESA}, which are thermal nuclear burning results. Our best fitting model is from the screened Coulomb potential scenario, which has parameters of log($M_{\rm He}/M_{\rm *}$) = -2.4, log($M_{\rm H}/M_{\rm *}$) = -5.2, $T_{\rm eff}$ = 11100\,K, $M_{\rm *}$ = 0.710\,$M_{\odot}$, log$g$ = 8.194, and $σ_{RMS}$ = 2.86\,s. The value of $σ_{RMS}$ is the smallest among the four existing asteroseismological work. The average period spacing is 46.299\,s for $l$ = 1 modes and 25.647\,s for $l$ = 2 modes. The other 6 observed modes can be fitted by $m$ $\neq$ 0 components of some modes for our best fitting model. Fitting the 25 observed modes, we obtain a $σ_{RMS}$ value of 2.59\,s. Considering the period spacings, we also assume, that at least in one case, we detect an $l$ = 2 trapped mode.
