快速振荡的A型特殊星

Rapidly Oscillating A-type Peculiar Stars

快速振荡的Ap星(roAp),作为高阶P模式非径向脉动的主序星,已成为星震学研究的主要目标之一。通过对roAp星振荡的分析,可以获取磁Ap星有价值的、甚至唯一的资料。可以研究roAp星的半径、自转周期、演化态、大气结构,甚至恒星内部磁场等等。本文综述了roAp星的发现及其现有基本数据,介绍了Ap星的一般特点与倾斜转子模型,介绍了roAp星的一般特点与倾斜脉动模型。讨论了roAp星的激发机制以及最新的研究发展。

Today, rapidly oscillating Ap (roAp) stars are one kind of most principal objects in the asteroseismologic study, which exhibit nonradial p-modes pulsations with very high overtone. As ideal targets for the new techniques of asteroseismology, analyses of roAp oscillations are yielding valuable, even unique information about magnetic peculiar stars. By comparing observed frequency spectrum to asymptotic pulsation theory, we can investigate diverse properties of roAp stars, radius, rotation period, evolutionary status, the geometry and internal strength of magnetic field; and, potentially, the detailed temperature structure of the atmosphere. In this paper, the discovery of roAp stars and their basic data are reveiwed. The general characteristics of Ap stars and the oblique rotator model, also, the general characteristics of roAp stars and the oblique pulsator model, are introduced. In addition, the excitation mechanisms and recent research developments of roAp stars are discussed.