| Infall and Outflow Activities in the Be star FY CMa |
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| 作者姓名： | Hui-Lai Cao National Astronomical Observatories Chinese Academy of Sciences Beijing CAS-PKU Joint Beijing Astrophysics Center Peking University Beijing |
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| 作者单位： | Hui-Lai Cao National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 CAS-PKU Joint Beijing Astrophysics Center，Peking University，Beijing 100871 |
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| 基金项目： | This work was performed under the auspices of Max-Planck Society of Germany，the National NaturaI Science Foundation of China |
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| 摘 要： | Unusual activity of outflow mass motion connected with infail events was recorded for the B0.5 IVe star FY CMa in February 1987 from both archival IUE spectrograms of cixcumstellar Nv resonance hnes and optical spectra of Hα and He I λ5876A emission lines which showed inverse P Cygni-type profiles. We estimate the mass loss rate using ultraviolet SiIvresonance lines with expanding atmosphere modeling calculations, and describe how the radial pressure performs the dominant role in accelerating the stellar wind. We attempt to give a qualitative explanation for the activity observed for FY CMa in terms of circumstellar matter raining down to the star.
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| 关 键 词： | 恒星 光谱图 光学 紫外线 模型 射线 环绕恒星 包层 |
Infall and Outflow Activities in the Be star FY CMa |
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| Hui-Lai Cao National Astronomical Observatories,Chinese Academy of Sciences,Beijing CAS-PKU Joint Beijing Astrophysics Center,Peking University,Beijing .Infall and Outflow Activities in the Be star FY CMa[J].Chinese Journal of Astronomy and Astrophysics,2001,1(6):514-524. |
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| Authors: | Hui-LaiCao |
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| Institution: | NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing100012 |
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| Abstract: | |
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| Keywords: | line: proffles - stars: activity - stars: emission-line Be -circumstellar matter - stars: mass-loss - ultraviolet: stars |
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