富氧agb星包层中无定形氧化铝尘埃的光学特性

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
K. Suh
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引用次数: 6

摘要

利用实验室测量的光学数据研究了富O渐近巨支(AGB)恒星周围包络层中无定形氧化铝(Al₂O₃)尘埃颗粒的光学性质。在满足Kramers-Kronig关系的较宽波长范围内,我们推导出了非晶态氧化铝的光学常数,并重现了实验数据。利用无定形氧化铝和硅酸盐粉尘,我们将辐射传递模型的结果与观测到的光谱能量分布进行了比较。将理论模型与大量富氧AGB恒星的各种红外双色图观测结果进行比较,我们发现非晶态氧化铝尘埃(约10-40%)与非晶态硅酸盐混合较好地模拟了具有薄尘包层的富o AGB恒星的观测点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
OPTICAL PROPERTIES OF AMORPHOUS ALUMINA DUST IN THE ENVELOPES AROUND O-RICH AGB STARS
We investigate optical properties of amorphous alumina (Al₂O₃) dust grains in the envelopes around O-rich asymptotic giant branch (AGB) stars using laboratory measured optical data. We derive the optical constants of amorphous alumina over a wide wavelength range that satisfy the Kramers-Kronig relation and reproduce the laboratory data. Using the amorphous alumina and silicate dust, we compare the radiative transfer model results with the observed spectral energy distributions. Comparing the theoretical models with observations on various IR two-color diagrams for a large sample of O-rich AGB stars, we find that the amorphous alumina dust (about 10-40%) mixed with amorphous silicate better models the observed points for the O-rich AGB stars with thin dust envelopes.
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来源期刊
Journal of the Korean Astronomical Society
Journal of the Korean Astronomical Society 地学天文-天文与天体物理
CiteScore
1.30
自引率
10.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.
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