NSTARS: Understanding the L- and T-dwarfs

marley, Mark，《NStars：理解l型矮星和t型矮星》Marley正致力于为l -矮星和t -矮星制作一个光谱目录模型。这些天体也被称为“棕矮星”，它们中的大多数都低于正常恒星的氢燃烧极限。为了促进棕矮星的发现和后续研究，Marley博士和他的同事们正在计算一个理论高分辨率光谱库，涵盖0.5-1000微米的波长范围，适用于有效温度在500-2200 K之间，金属丰度在-2 [Fe/H] 0.5之间的物体。该模型包括碱金属的不透明度和含尘冷凝物的影响。将得到的模型光谱与L-矮星和t -矮星在整个温度和年龄范围内的观测光谱进行比较。研究结果通过网络发布给科学界。该项目的资金由美国国家科学基金会恒星天文学和天体物理学（AST/SAA）计划通过美国国家科学基金会/美国国家航空航天局的联合“邻近恒星（NStars）”倡议，以及美国国家科学基金会数学和物理科学理事会多学科活动办公室（MPS/OMA）提供。

AST-0086288Marley, Mark"NStars: Understanding the L-dwarfs and T-dwarfs"Dr. Marley is working to produce a model spectral catalog for L-dwarf and T-dwarf stars. Also known as 'brown dwarf stars,' most of these objects are below the hydrogen-burning limit for normal stars. To facilitate the discovery of and subsequent follow-up research on brown dwarfs Dr. Marley and colleagues are computing a library of theoretical high-resolution spectra covering the wavelength regime of 0.5-1000 micrometers appropriate for objects with effective temperatures ranging from 500-2200 K and metallicities ranging from -2 [Fe/H] 0.5. The models include the opacity of alkali metals and the influence of dusty condensates. The resulting model spectra are compared to the observed spectra of L- and T-dwarfs over the full temperature and age ranges of L- and T-dwarfs. The results are distributed to the scientific community via the web.Funding for this project was provided by the NSF Stellar Astronomy & Astrophysics (AST/SAA) program through the joint NSF/NASA "Nearby Stars (NStars)" initiative, and the NSF Mathematical & Physical Sciences Directorate Office of Multidisciplinary Activities (MPS/OMA).