Spectral analyses of M, L, and T dwarf stars

M、L 和 T 矮星的光谱分析

• 批准号: 5419666
• 负责人: Professor Dr. Peter H. Hauschildt
• 金额: --
• 依托单位: Hamburger Sternwarte
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5419666?language=en
• 关键词: Spectral; analyses; dwarf; stars

This proposal constitutes a request for support for a three year study of the atmospheres and spectra of cool dwarf stars (ranging from M dwarfs to Brown Dwarfs and Extrasolar Giant Planets [EGPs]) using model atmospheres and synthetic spectra. This project addresses important problems in astrophysics with applications to a wide range of other areas, for example the accurate determination of (sub)stellar parameters and element abundances and the detailed physics of cool stellar atmospheres. The proposed funds will support a student (Matthias Dehn) at the BAT IIa/2 level who will use parts of the results in his PhD thesis. We will carry out detailed non-LTE (NLTE) model atmosphere simulations for cool dwarf stars, brown dwarfs and EGPs using our PHOENIX program package. A fundamental advantage of our approach is that we will use a homogeneous set of model assumptions and input physics for all calculations. As a result of this project we will be able to provide internally consistent model atmospheres and synthetic spectra for nearly all objects in the lower Hertzsprung-Russell diagram. Our models will deliver an improved mapping from observed colors and spectra to stellar masses through the synthetic photometry and evolutionary models.

这项提案是对利用模型大气和合成光谱对冷矮星(从M矮星到棕矮星和太阳系外巨行星[EGP])的大气层和光谱进行为期三年的研究的请求。这个项目解决了天体物理学中的重要问题，并应用于广泛的其他领域，例如准确确定(亚)恒星参数和元素丰度，以及详细的冷恒星大气物理。拟议的资金将支持一名英美烟草公司IIa/2级学生(Matthias Dehn)，他将在博士论文中使用部分结果。我们将使用我们的凤凰号程序包对冷矮星、棕矮星和EGP进行详细的非LTE(NLTE)模式大气模拟。我们方法的一个基本优势是，我们将使用一套统一的模型假设和输入物理来进行所有计算。作为这个项目的结果，我们将能够提供内部一致的模式大气和合成光谱的几乎所有物体在较低的赫茨斯普龙格-罗素图表。我们的模型将通过合成测光和演化模型提供从观测到的颜色和光谱到恒星质量的改进映射。