THE RING-SHAPED NEBULAE AROUND FU ORIONIS STARS.(HARO 2-249 = HARO 4-249).
THE RING-SHAPED NEBULAE AROUND FU ORIONIS STARS.(HARO 2-249 = HARO 4-249).
复制标题
猎户座 FU 恒星周围的环形星云。（哈罗 2-249 = 哈罗 4-249）。
DOI：
10.1086/131963
复制
发表时间：
1987
影响因子：
3.5
通讯作者：
R. Goodrich
中科院分区：
文献类型：
--
作者：
R. Goodrich
所有五颗已知的 FU 猎户座恒星都与环形星云有关。显示了三个星云的深部 CCD 图像和光谱，即与 V1057 Cyg、V1515 Cyg 和 V1735 Cyg 相关的星云。所有三个星云的光谱都清楚地来自反射。简要讨论了尘埃壳的粗略模型，并认为这些尘埃壳可能表明猎户座 FU 恒星处于相对高级的演化状态。壳层的细长形状可能是恒星通过母体分子云相对运动的结果，在这种情况下只有一个空腔。当恒星到达空腔边缘并吸积新物质时，猎户座 FU 爆发本身可能会发生。讨论了一些有关爆发本身的最新模型，并提出了对这些模型的一些观测测试。
All five of the known FU Orionis stars are associated with ring-shaped nebulae. Deep CCD images and spectra are presented of three of the nebulae, those associated with V1057 Cyg, V1515 Cyg, and V1735 Cyg. The spectra of all three nebulae are clearly from reflection. A crude model for the dust shells is briefly discussed, and it is argued that the shells may indicate a relatively advanced evolutionary state for the FU Orionis stars. The elongated shape of the shells may be the result of the relative motion of the star through the parent molecular cloud, in which case there is only a single cavity. The FU Orionis outburst itself may then occur when the star reaches the edge of the cavity and fresh material is accreted. Some of the more recent models for the outburst itself are discussed and some observational tests of these models suggested.