标题： Herbig Ae/Be 星球旋转振动 OH 发射的研究 显示英文标题

标题： A Study of Ro-vibrational OH Emission from Herbig Ae/Be Stars

摘要： 我们研究了围绕21颗赫比格Ae/Be星盘状天体的转动态和振动态OH与CO发射。 我们发现OH和CO的亮度在恒星紫外亮度的广泛范围内呈正比关系。 OH和CO的谱线轮廓也相似，表明它们起源于盘状天体大致相同的径向区域。 CO和OH发射都与恒星的远紫外线亮度相关联，而PAH（多环芳烃）亮度则与恒星的长波紫外线亮度相关联。 尽管盘状天体的翘曲影响了PAH亮度，但它并不是OH和CO发射亮度的因素。 这些特性与UV辐射盘状大气模型一致。 我们还发现，在样本中的过渡盘状天体具有较大的光学薄内区，其OH和CO亮度低于具有类似紫外亮度的非过渡盘状天体源。 这一结果，虽然由于样本量小而显得初步，但与过渡盘状天体缺乏靠近恒星的气态盘的解释一致。 显示英文摘要

摘要： We present a study of ro-vibrational OH and CO emission from 21 disks around Herbig Ae/Be stars. We find that the OH and CO luminosities are proportional over a wide range of stellar ultraviolet luminosities. The OH and CO line profiles are also similar, indicating that they arise from roughly the same radial region of the disk. The CO and OH emission are both correlated with the far-ultraviolet luminosity of the stars, while the PAH luminosity is correlated with the longer wavelength ultraviolet luminosity of the stars. Although disk flaring affects the PAH luminosity, it is not a factor in the luminosity of the OH and CO emission. These properties are consistent with models of UV-irradiated disk atmospheres. We also find that the transition disks in our sample, which have large optically thin inner regions, have lower OH and CO luminosities than non-transition disk sources with similar ultraviolet luminosities. This result, while tentative given the small sample size, is consistent with the interpretation that transition disks lack a gaseous disk close to the star.