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arXiv 1002.3554astro-ph.SR
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IRC +10216星周包层中的气相原子金属

Gas phase atomic metals in the circumstellar envelope of IRC+10216

N. Mauron, P. Huggins

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11 pages, 8 Figures. Accepted by Astronomy and Astrophysics
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摘要：

我们报告了在AGB碳星IRC+10216的拱星包层中寻找气相原子金属的结果。搜索是使用高分辨率（R=50000）光学吸收光谱的背景恒星，探测信封上的视线35”从中心。我们在包封中检测到的金属物质包括NaI、KI、CaI、CaII、CrI和FeI，上限为AlI、MnI、TiI、TiII和SrII。观测结果用于确定气相中的金属丰度和颗粒上的冷凝。金属损耗的范围从Na的5倍到Ca的300倍，与星际云的损耗模式有些相似。我们的研究结果直接限制了金属在富含碳的拱星信封和固体和气相金属的混合返回的恒星ISM的冷凝效率。我们观察到的未凝聚金属原子的丰度通常大于信封中检测到的含金属分子的丰度。因此，金属原子是气相中的主要金属物质，并且可能在金属化学中起关键作用。

英文摘要：

We report the results of a search for gas phase atomic metals in the circumstellar envelope of the AGB carbon star IRC+10216. The search was made using high resolution (R=50000) optical absorption spectroscopy of a backgound star that probes the envelope on a line of sight 35" from the center. The metal species that we detect in the envelope include NaI, KI, CaI, CaII, CrI, and FeI, with upper limits for AlI, MnI, TiI, TiII, and SrII. The observations are used to determine the metal abundances in the gas phase and the condensation onto grains. The metal depletions range from a factor of 5 for Na to 300 for Ca, with some similarity to the depletion pattern in interstellar clouds. Our results directly constrain the condensation efficiency of metals in a carbon-rich circumstellar envelope and the mix of solid and gas phase metals returned by the star to the ISM. The abundances of the uncondensed metal atoms that we observe are typically larger than the abundances of the metal-bearing molecules detected in the envelope. The metal atoms are therefore the major metal species in the gas phase and likely play a key role in the metal chemistry.

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