The Nature and Evolution of Disks Around Hot Stars
The Nature and Evolution of Disks Around Hot Stars
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发表时间：
2005-11
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通讯作者：
R. Ignace;K. Gayley
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作者：
R. Ignace;K. Gayley
已知 B[e] 超巨星拥有流出的冷盘，但一些未分类的 B[e] 恒星也显示出中性盘存在的明确迹象。我们通过对光谱中出现的 [Oi] 线的线光度进行建模，推导出小麦哲伦星云 B[e] 超巨星 Hen S 18 和未分类银河系 B[e] 星 Hen 2-90 的盘质量损失率、温度分布和盘张角的约束。这些线应该在氢中性盘中形成。我们发现盘质量通量量级为 3.4 × 10 g scm 和 5.5 × 10 g scm，导致 Hen S 18 和 Hen 2-90 的盘质量损失率分别为 1.0 × 10 M ̄yr 和 1.5 × 10 M ̄yr。
B[e] supergiants are known to possess outflowing cool disks but also some unclassified B[e] stars show clear indications for the presence of a neutral disk. We derive constraints on the disk mass loss rates, temperature distributions and disk opening angles for the Small Magellanic Cloud B[e] supergiant Hen S 18 and the unclassified galactic B[e] star Hen 2-90 by modeling the line luminosities of the [Oi] lines arising in their optical spectrum. These lines are supposed to form in a hydrogen neutral disk. We find disk mass fluxes of order 3.4 × 10 g scm and 5.5 × 10 g scm resulting in disk mass loss rates of 1.0 × 10 M ̄yr and 1.5 × 10 M ̄yr for Hen S 18 and Hen 2-90, respectively.