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Lamost 试观测项目: 年轻疏散星团中锂的耗散及其与其他恒星参量的相关性研究

Lamost 试观测项目: 年轻疏散星团中锂的耗散及其与其他恒星参量的相关性研究. 李金增 国家天文台. 锂的主序前演化研究 -目标源样本. NGC 2244 (1.9 Myr) NGC 2264 (3-5 Myr) NGC 1999 NGC 1333 等一系列处于不同演化阶段的年轻疏散星团. 科学目标(低色散). 特定恒星形成区发射线星的搜巡、证认及分类,给出局域发射线星表(类似于 HB 星表- Orion, Taurus-Auriga… ) 各天区发射线星的统计性质,如检验并确立 TTS 基于光谱型及线宽的新的分类标准

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Lamost 试观测项目: 年轻疏散星团中锂的耗散及其与其他恒星参量的相关性研究

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  1. Lamost试观测项目:年轻疏散星团中锂的耗散及其与其他恒星参量的相关性研究Lamost试观测项目:年轻疏散星团中锂的耗散及其与其他恒星参量的相关性研究 李金增 国家天文台

  2. 锂的主序前演化研究 -目标源样本 • NGC 2244 (1.9 Myr) • NGC 2264 (3-5 Myr) • NGC 1999 • NGC 1333 等一系列处于不同演化阶段的年轻疏散星团

  3. 科学目标(低色散) • 特定恒星形成区发射线星的搜巡、证认及分类,给出局域发射线星表(类似于HB星表-Orion, Taurus-Auriga…) • 各天区发射线星的统计性质,如检验并确立TTS基于光谱型及线宽的新的分类标准 • CTTS与WTTS间的演化关系,在特定SFR中的比率及其与恒星形成环境间的相关性研究 • Disk fraction and disk evolution • 选源:H prism survey or photometric observations

  4. 科学目标(中色散) X-射线选WTTS的光学证认与特性研究 • 选源:ROSAT HRI or Chandra observations

  5. Why intermediate resolution? • RV - membership determination • 成员星RV、v·sini 的统计分布, spin-up • 精确给出其他恒星物理参量如化学丰度等 • Binary faction in young open clusters • 吸积相关的光谱特性及其与吸积率的关系(IPC profile或发射线的非对称性)

  6. Spectral coverage requested • Blue: 5000 - 5300 Ǻ for the determination of stellar parameters such as Teff., RV …… • Red: 6400 - 6800 Ǻ, Covering both H and Li I

  7. 同一质量主序前类太阳恒星锂耗散何时开始? Possible contamination by aged young stars still in association with specific SFRs, membership determination is thus a key factor for such studies

  8. NGC 2392 (1.8 Myr)

  9. 主序前锂的耗散及与恒星自转、色球活动强度、有效温度间的相关性研究主序前锂的耗散及与恒星自转、色球活动强度、有效温度间的相关性研究

  10. 年轻疏散星团NGC 2244 • 可进一步确定星团的年龄(1.9 - 3Myr) • 星团形成环境对于disk dissipation的影响

  11. NGC 2244 emerging from Rosette

  12. 光纤光谱的优点 • 对于展源如喷流激发源可以更好的选取和减掉天光及背景辐射如HII区延展发射的影响

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