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arXiv 0811.3440astro-ph
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银河系高纬度的恒星形成与分子云

Star Formation and Molecular Clouds at High Galactic Latitude

Peregrine M. McGehee

摘要:

在这一章中,我们将回顾在银河系高纬度地区发现的年轻恒星和分子云$(|b| \ge 30^\circ)$。这些主要与天空中的两个大尺度结构,古尔德带和金牛座恒星形成区,以及少数分子云,包括MBM 12和MBM 20,作为一个群体,由离我们太阳最近的恒星形成地点组成。也有一些年轻的恒星被发现在明显的孤立远离任何分子云。高纬度云主要是半透明的分子云和弥漫的银河卷云,其中大部分在高纬度看到,只是因为它们靠近太阳。罕见的例外是那些,像Draco和其他中等或高速云,发现显着高于或低于银河平面。我们审查的过程中,导致在这些低密度和extraplanar环境中的恒星形成,以及孤立的金牛座T星的生产机制。我们提出并讨论了已知的高纬度恒星托儿所和年轻的恒星对象。

英文摘要:

In this chapter we review the young stars and molecular clouds found at high Galactic latitudes $(|b| \ge 30^\circ)$. These are mostly associated with two large-scale structures on the sky, the Gould Belt and the Taurus star formation region, and a handful of molecular clouds including MBM 12 and MBM 20 which, as a population, consist of the nearest star formation sites to our Sun. There are also a few young stars that are found in apparent isolation far from any molecular cloud. The high latitude clouds are primarily translucent molecular clouds and diffuse Galactic cirrus with the majority of them seen at high latitude simply due to their proximity to the Sun. The rare exceptions are those, like the Draco and other intermediate or high velocity clouds, found significantly above or below the Galactic plane. We review the processes that result in star formation within these low density and extraplanar environments as well as the mechanisms for production of isolated T Tauri stars. We present and discuss the known high-latitude stellar nurseries and young stellar objects.

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