Asteroseismology of chemically peculiar stars

Third Coast Pub Date : 2008-12-01 DOI:10.1553/cia159s61

O. Kochukhov

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引用次数: 8

Abstract

Pulsational variability is observed in several types of main sequence stars with anomalous chemical abundances. In this contribution I summarize the relationship between pulsations and chemical peculiarities, giving special emphasis to rapid oscillations in magnetic Ap stars. These magneto-acoustic pulsators provide unique opportunities to study the interaction of pulsations, chemical inhomogeneities, and strong magnetic fields. Time-series monitoring of rapidly oscillating Ap stars using high-resolution spectrometers at large telescopes and ultra-precise space photometry has led to a number of important breakthroughs in our understanding of these interesting objects. Interpretation of the roAp frequency spectra has allowed constraining fundamental stellar parameters and probing poorly known properties of the stellar interiors. At the same time, investigation of the pulsational wave propagation in chemically stratified atmospheres of roAp stars has been used as a novel asteroseismic tool to study pulsations as a function of atmospheric height and to map in detail the horizontal structure of the magnetically-distorted p modes. Individual Objects: HR 8799, HD 116114, HD 201601 (γ Equ), HD 176232 (10 Aql), HD 134214, HD 137949 (33 Lib), HD 99563, HD 24712, HD 75445, HD 137909 (β CrB), HD 101065, HR 3831

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化学上特殊恒星的星震学

在几种具有异常化学丰度的主序星中观测到脉动变异性。在这篇文章中，我总结了脉动和化学特性之间的关系，特别强调了磁性Ap星的快速振荡。这些磁声脉动器为研究脉动、化学不均匀性和强磁场之间的相互作用提供了独特的机会。利用大型望远镜上的高分辨率光谱仪和超精密空间测光技术对快速振荡的Ap星进行时间序列监测，使我们对这些有趣天体的理解取得了许多重要突破。对roAp频谱的解释可以限制恒星的基本参数，并探测恒星内部鲜为人知的特性。同时，对roAp恒星化学分层大气中脉动波传播的研究已被用作一种新的星震工具，用于研究脉动与大气高度的关系，并详细绘制磁畸变p模态的水平结构。单个天体:HR 8799、HD 116114、HD 201601 (γ Equ)、HD 176232 (10 Aql)、HD 134214、HD 137949 (33 Lib)、HD 99563、HD 24712、HD 75445、HD 137909 (β CrB)、HD 101065、HR 3831

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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