Project P9: Photospheric and chromospheric models of debris disk host stars

项目 P9：碎片盘主星的光球和色球模型

• 批准号: 278214436
• 负责人: Professor Dr. Peter H. Hauschildt
• 金额: --
• 依托单位: Lunar and Planetary Laboratory
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/278214436?language=en
• 关键词: Project; P9; Photospheric; chromospheric; models

Recent studies of debris disk host stars have shown that these are stars are often fast rotators, some of them harbor magnetic fields and again some of them show rather unexpected evidence for chromospheric and even coronal activity. As a consequence new effects must be included in any state-of-the-art modeling of these stars. The main task of this project is to improve the modeling of the atmospheres of debris disk central stars and provide synthetic spectra for these objects; at the same time the relevant stellar parameters and elemental abundances will be provided. We also plan to investigate the influence of the chromospheric and possibly coronal corrections to the far-IR spectra as well as effects of fast stellar rotation on the stellar parameters that were recently realized to be important for debris disks and study possible activity diagnostics for these objects. The results will be important as inputs for the debris disk simulations, and the far IR spectra will be useful to disentangle the stellar and disk contributions to the observed spectra (projects P1-P4). We will also provide information on stellar UV fields for the project P8.

最近对碎片盘宿主恒星的研究表明，这些恒星通常是快速旋转的，其中一些拥有磁场，其中一些显示出意想不到的色球甚至日冕活动的证据。因此，在对这些恒星进行最先进的建模时，必须考虑到新的效应。本项目的主要任务是改进碎片盘中心星的大气模型，提供这些天体的合成光谱；同时将提供相关的恒星参数和元素丰度。我们还计划研究色球和可能的日冕修正对远红外光谱的影响，以及快速恒星旋转对恒星参数的影响，这些参数最近被认为对碎片盘很重要，并研究这些物体可能的活动诊断。这些结果将作为碎片盘模拟的重要输入，而远红外光谱将有助于解开恒星和磁盘对观测光谱的贡献（项目P1-P4）。我们还将为P8项目提供恒星紫外线场的信息。