arXiv 1109.42852011-09-20astro-ph.SR

有效包层对流对盾牌座delta星类太阳振荡的激发

The excitation of solar-like oscillations in a delta Scuti star by efficient envelope convection

V. Antoci, G. Handler, T. L. Campante, A. O. Thygesen, A. Moya, T. Kallinger, D. Stello, A. Grigahcène, H. Kjeldsen, T. R. Bedding, T. Lüftinger, J. Christensen… 展开作者

V. Antoci, G. Handler, T. L. Campante, A. O. Thygesen, A. Moya, T. Kallinger, D. Stello, A. Grigahcène, H. Kjeldsen, T. R. Bedding, T. Lüftinger, J. Christensen-Dalsgaard, G. Catanzaro, A. Frasca, P. De Cat, K. Uytterhoeven, H. Bruntt, G. Houdek, D. W. Kurtz, P. Lenz, A. Kaiser, J. Van Cleve, C. Allen, B. D. Clarke

备注：: to appear as a Letter to Nature
DOI：: 10.1038/nature10389

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摘要：

盾牌座δ（delta Sct）星是质量为1.5- 2.5 M $_{\odot}$的不透明度驱动的脉动星，它们的脉动是由氦的电离变化引起的。在像太阳这样质量较小的恒星中，对流通过恒星外部的30%传输质量和能量，并激发出丰富的共振声学模式。以太阳为例，在没有坚实理论基础的情况下，模型预测三角洲星的对流包络仅延伸半径的1%左右，但有足够的能量激发类似太阳的振荡。在开普勒任务之前没有观察到这一点，因此模型中对流包络的存在受到了质疑。在这里，我们报告检测到的三角洲星HD 187547类似太阳的振荡，这意味着表面对流有效地运行在恒星的质量约为太阳的两倍，特设模型预测。

英文摘要：

Delta Scuti (delta Sct) stars are opacity-driven pulsators with masses of 1.5-2.5M$_{\odot}$, their pulsations resulting from the varying ionization of helium. In less massive stars such as the Sun, convection transports mass and energy through the outer 30 per cent of the star and excites a rich spectrum of resonant acoustic modes. Based on the solar example, with no firm theoretical basis, models predict that the convective envelope in delta Sct stars extends only about 1 per cent of the radius, but with sufficient energy to excite solar-like oscillations. This was not observed before the Kepler mission, so the presence of a convective envelope in the models has been questioned. Here we report the detection of solar-like oscillations in the delta Sct star HD 187547, implying that surface convection operates efficiently in stars about twice as massive as the Sun, as the ad hoc models predicted.

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