Stellar Oscillations in Planet Hosting K Giant Stars

该项目将使用精确的恒星径向速度测量来研究K巨星所在行星的恒星振荡。这些数据将用于确定恒星的基本参数，特别是恒星质量。在20多颗巨星周围发现了系外行星。这些发现是重要的，因为宿主恒星的质量在1.1 - 2.5 M突之间，明显高于大多数行星宿主恒星的质量。径向速度测量已经发现了大多数已知的太阳系外行星，但由于恒星线的缺乏和恒星旋转速度的高，它不适合在这种恒星质量的主序星周围搜索行星。然而，由于覆盖大范围质量的主序星的演化轨迹都汇聚在色星等图的巨星分支上，因此确定巨星的恒星质量是很困难的。利用我们的研究所探测到的脉动模式，我们将得到大量巨型恒星样本的精确质量。与合作者合作将使用干涉测量法来获得我们计划恒星的精确恒星半径。对计划恒星的恒星半径和质量的综合测量最终可以用来校准恒星演化等时线，以便将来可以用来确定承载巨星的行星的精确质量。

This project will study stellar oscillations in planet hosting K giant star using precise stellar radial velocity measurements. These will be used to determine basic stellar parameters, in particular, the stellar mass. Extrasolar planets have been discovered around over 20 giant stars. These discoveries are important because the host stars have masses in the range of 1.1 - 2.5 Mʘ, signficantty higher than the masses of most planet hosting stars. Radial velocity surveys, which have discovered most of the known extrasolar planets, are ill-suited for planet searches around main sequence stars of this stellar mass because of the paucity of stellar lines and high stellar rotation rates. However, the determination of the stellar mass of giant stars is difficult because the evolutionary tracks of main sequence stars covering a wide range of masses all converge on the giant branch of the color magnitude diagram. Using the pulsation modes detected by our study we will derive accurate masses for a large sample of giant stars. Work with collaborators will use interferometric measurements to get accurate stellar radii for our program stars. The combined measurements of the stellar radii and masses for the program stars can ultimately be used to calibrate stellar evolutionary isochrones so that in future these can be used to determine accurate masses of planet hosting giant stars.