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Westerhout 40
W 40 (= Sh2-64 or RCW 174) is a star-forming region in the Milky Way Galaxy in the constellation Serpens Cauda. At a distance of approximately 500 parsecs〔〔〔 (1600 ly) this is one of the nearest sites forming O- and B-type stars. However, it is highly obscured by its molecular cloud, and cannot easily be observed in visible wavelengths of light.〔〔 Ionizing radiation from the massive OB stars have created an H II region〔 which has an hour-glass morphology.〔
Like all star-forming regions, W40 is made up of several components: the cluster of new-born stars and the gaseous material from which these stars form (the interstellar medium). Most of the gas is in the form of molecular clouds, the coldest, densest phase of the interstellar medium, which is made up of mostly molecular hydrogen (H2). However, feedback from the star cluster has ionized some of the gas and blown a bubble in the cloud around the cluster.
==On the Sky ==
The W40 star-forming region is projected on the sky in the direction of the Serpens-Aquila Rift, a mass of dark clouds above the Galactic plane in the constellations Aquila, Serpens, and eastern Ophiuchus.〔 The high extinction from these foreground clouds means that this region looks unimpressive in the optical, despite being one of the nearest sites of massive star formation. Also residing nearby on the sky are Serpens south, an infrared dark cloud that is actively forming stars,〔 and the Serpens Main cluster.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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