A new asteroseismic diagnostic for internal rotation in γ Doradus stars
A new asteroseismic diagnostic for internal rotation in γ Doradus stars
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DOI：
10.1093/mnras/stw2717
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发表时间：
2016-10
影响因子：
4.8
通讯作者：
R. Ouazzani;S. Salmon;V. Antoci;T. Bedding;T. Bedding;Simon J. Murphy;Simon J. Murphy;I. Roxburgh
中科院分区：
文献类型：
--
作者：
R. Ouazzani;S. Salmon;V. Antoci;T. Bedding;T. Bedding;Simon J. Murphy;Simon J. Murphy;I. Roxburgh
With four years of nearly-continuous photometry from Kepler, we are finally in a good position to apply asteroseismology to $\gamma$ Doradus stars. In particular several analyses have demonstrated the possibility to detect non-uniform period spacings, which have been predicted to be directly related to rotation. In the present work, we define a new seismic diagnostic for rotation in $\gamma$ Doradus stars that are too rapidly rotating to present rotational splittings. Based on the non uniformity of their period spacings, we define the observable $\Sigma$ as the slope of the period spacing when plotted as a function of period. We provide a one-to-one relation between this observable $\Sigma$ and the internal rotation, which applies widely in the instability strip of $\gamma$ Doradus stars. We apply the diagnostic to a handful of stars observed by Kepler. Thanks to g-modes in $\gamma$ Doradus stars, we are now able to determine the internal rotation of stars on the lower main sequence, which is still not possible for Sun-like stars.
