Nstars: Understanding the L-dwarfs and T-dwarfs

Freedman，Richard“NStars：Understanding the L-dwarfs and T-dwarfs“AST-0086234 Dr.弗里德曼正在制作一个L型矮星和T型矮星的模型光谱目录。 也被称为“褐矮星”，这样的物体低于正常恒星的氢燃烧极限。 为了促进褐矮星的发现和后续研究，Freedman博士及其同事正在计算一个高分辨率光谱库，覆盖0.5-1000微米的波长范围，适用于有效温度范围为500-2200 K和金属丰度范围为-2 [Fe/H] 0.5的物体。 计算中考虑了碱金属的不透明度和尘埃凝结物的影响。 由此产生的模型光谱进行比较，观察到的光谱的L-和T-矮星在整个范围内的L-和T-矮星。 该项目的资金由NSF恒星天文学天体物理学（AST/SAA）计划通过NSF/NASA联合“邻近恒星（NStars）”倡议和NSF数学物理科学理事会多学科活动办公室（MPS/OMA）提供。

ABSTRACTFreedman, Richard"NStars: Understanding the L-dwarfs and T-dwarfs"AST-0086234Dr. Freedman is producing a model spectral catalog for L-dwarf and T-dwarf stars. Also known as 'brown dwarf stars,' such objects are below the hydrogen-burning limit for normal stars. To facilitate the discovery of and subsequent follow-up research on brown dwarfs Dr. Freedman and colleagues are computing a library of 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 opacity of alkali metals and the influence of dusty condensates are included in the calculations. The resulting model spectra are compared to observed spectra of L- and T-dwarfs over the full range 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).