The excess infrared emission of Herbig Ae/Be stars - Disks or envelopes?
The excess infrared emission of Herbig Ae/Be stars - Disks or envelopes?
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Herbig Ae/Be 恒星过量的红外发射——圆盘还是包层？
DOI：
10.1086/172507
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
N. Calvet
中科院分区：
文献类型：
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作者：
L. Hartmann;S. Kenyon;N. Calvet
我们认为，许多赫比格Ae/Be星的近红外辐射产生在周围的尘埃信封，而不是拱星盘。Hillenbrand等人和Lada &亚当斯指出，再现Ae/Be星近红外光谱能量分布中的103 μm峰值的星周盘模型必须具有高吸积率，并且必须在其内部区域是透明的，或者具有物理内部盘孔。然而，我们表明Ae/Be星周围的盘在所需的吸积率下可能保持光学厚度。或者，盘中存在物理洞的假设意味着大量物质堆积在100恒星半径处，或者100%的吸积亮度无法被检测到。
We suggest that the near-infrared emission of many Herbig Ae/Be stars arises in surrounding dusty envelopes, rather than circumstellar disks. Hillenbrand et al. and Lada & Adams showed that circumstellar disk models which reproduce the ∼3 μm peaks in the near-infrared spectral energy distributions of Ae/Be stars must have high accretion rates, and must either be transparent in their inner regions, or have physical inner disk holes. However, we show that disks around Ae/Be stars are likely to remain optically thick at the required accretion rates. Alternatively, the assumption of a physical hole in the disk implies either that large amounts of material pile up at ∼10 stellar radii or that ∼90% of the accretion luminosity escapes detection