Study of the interaction between oscillation and the rotation of stars based on rosette modes

2017 Fiscal Year Final Research Report

• Project/Area Number: 26400219
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: Takata Masao 東京大学, 大学院理学系研究科(理学部), 助教 (20334245)
• Co-Investigator(Kenkyū-buntansha): 斉尾 英行 東北大学, 理学研究科, 名誉教授 (10162174)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 恒星振動 / 回転

Outline of Final Research Achievements

The purpose of this project is to examine theoretically the properties of a unique type of oscillation eigenmodes of rotating stars, the rosette modes, which have recently been discovered in the numerical simulation. There are two main results: (1) clarification of the physical process of the mode formation, and (2) demonstration of the observability of the modes in real stars. As for (1), it has turned out that the interaction caused by the Coriolis force among the multiple eigenmodes, which have close frequencies in the absence of rotation, induces the unique structure of the modes. Concerning (2), we have shown that the modes can be excited in some B-type main-sequence stars by performing the numerical calculations based on evolutionary stellar models.

Free Research Field

天体物理学