The Perseus Cloud
The Perseus Cloud
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发表时间：
2008-12
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通讯作者：
J. Bally;J. Walawender;D. Johnstone;H. Kirk;A. Goodman
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作者：
J. Bally;J. Walawender;D. Johnstone;H. Kirk;A. Goodman
英仙座分子云及其周围包含几个活跃的或新近形成的恒星区域，位于太阳约300pC的范围内(见图1)。大约有12颗OB和1000多颗小于6Myr的低质量恒星组成了直径50 pC的英仙座OB2组合。最近在Per OB2组合中的超新星驱动一个膨胀的HI超级壳体进入周围的星际介质。这个星团的一颗失控恒星，ξPersi，照亮并电离了这个环的一部分，产生了加利福尼亚星云(NGC1499，Sh-2220)。10M⊙英仙座分子云是最接近的此类天体，活跃地形成了大量低质量到中等质量的恒星。星云的东端与2-4迈尔古老星团IC348有关，该星团包含数百颗年轻恒星。然而，英仙座星云的西部包含了当前恒星形成最活跃的地点，包括150个成员的NGC1333星团，与Barnard 1，L1448，L1455相关的小恒星聚集体，以及产生更小年轻恒星群的额外云核。窄带可视波长探测已经发现了一百多个单独的赫比格-哈罗天体。对英仙座分子云外流的研究已经阐明了它们对周围气体中湍流运动的产生、云核的破坏和恒星形成的自我调节的贡献。在这篇综述中，我们涵盖了从L=150到180，b=−30到0的天空区域，以及离太阳200到400pC，年龄小于15Myr的年轻恒星、星团和云，重点是英仙座分子云。这是Per OB2协会的影响范围。我们讨论了每个OB2超级壳层的直径为20，OB组合，它与周围分子气体的关系，以及英仙座分子云中正在进行的恒星形成。
The Perseus molecular cloud and its surroundings contain several regions of active or recent star formation lying within about 300 pc of the Sun (see Figure 1). Roughly a dozen OB and over a thousand lower mass stars younger than 6 Myr make up the 50 pc diameter Perseus OB 2 association. Recent supernovae in the Per OB2 association drive an expanding HI supershell into the surrounding interstellar medium. A run-away star from this association, ξ Persi, illuminates and ionizes a portion of this ring, producing the California Nebula (NGC 1499, Sh-2 220). The 10 M⊙ Perseus molecular cloud is the closest such object actively forming large numbers of low to intermediate-mass stars. The eastern end of the cloud is associated with the 2 – 4 Myr old cluster IC 348 that contains several hundred young stars. However, the western portion of the Perseus cloud contains the most active sites of current star formation, including the 150 member NGC 1333 cluster, the small stellar aggregates associated with Barnard 1, L1448, L1455, and additional cloud cores which are producing smaller groups of young stars. Narrow-band visual wavelength surveys have led to the discovery of over a hundred individual Herbig-Haro objects. Studies of outflows in the Perseus molecular cloud have illuminated their contribution to the generation of turbulent motions in the surrounding gas, the disruption of cloud cores, and the self regulation of star formation. In this review, we cover the region of the sky from about l = 150 to 180 and b = −30 to 0, and the young stars, clusters, and clouds which lie between 200 and 400 pc from the Sun with ages of less than about 15 Myr with an emphasis on the Perseus molecular cloud. This is the sphere of influence of the Per OB2 association. We discuss the 20 diameter Per OB2 supershell, the OB association, its relationship to surrounding molecular gas, and on-going star formation within the Perseus molecular cloud.