附近SN-II前身星参宿七的星震学第一部分。MOST高精度测光和径向速度监测
Asteroseismology of the Nearby SN-II Progenitor: Rigel Part I. The MOST High Precision Photometry and Radial Velocity Monitoring
摘要：
参宿七（猎户座β，B8 Ia）是一颗邻近的蓝超巨星，显示出天鹅座α型的变异性，是最近的II型超新星祖先之一。因此，它是研究核坍缩前恒星内部结构的一个很好的实验平台。在这项研究中，我们第一次提出了28天的高精度MOST测光和超过6年的光谱监测。本文报道了19个SNR>4.6的径向速度脉动模态，其变化时间尺度为1.21 ~ 74.7天，与高阶低阶重力模态有关。虽然径向速度的变化显示出一定程度的相关性与通量的变化，有不同的金属和H α线的等效宽度之间没有明显的相互作用。
英文摘要：
Rigel (beta Ori, B8 Ia) is a nearby blue supergiant displaying alpha Cyg type variability, and is one of the nearest type-II supernova progenitors. As such it is an excellent test bed to study the internal structure of pre core-collapse stars. In this study, for the first time, we present 28 days of high precision MOST photometry and over 6 years of spectroscopic monitoring. We report nineteen significant pulsation modes of SNR>4.6 from radial velocities, with variability time scales ranging from 1.21 to 74.7 days, which are associated with high order low degree gravity modes. While the radial velocity variations show a degree of correlation with the flux changes, there is no clear interplay between the equivalent widths of different metallic and Halpha lines.
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