NSTARS: Understanding the L-dwarfs and T-dwarfs

Lodders，Katharina“NStars：Understanding the L-dwarfs and T-dwarfs“AST-0086487Dr. Lodders正致力于为L型矮星和T型矮星制作一个模型光谱目录。 也被称为“褐矮星”，这些天体中的大多数都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，Lodders博士和同事们正在计算一个理论高分辨率光谱库，覆盖波长范围为0.5-1000微米，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。 这些模型包括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，在整个温度和年龄范围的L-和T-矮星的观测光谱。 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。

ABSTRACTLodders, Katharina"NStars: Understanding the L-dwarfs and T-dwarfs"AST-0086487Dr. Lodders 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. Lodders 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).