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・ Irby, Merseyside
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IRC-10414
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IRC-10414 : ウィキペディア英語版
IRC-10414


IRC-10414 is a red supergiant and runaway star in the constellation Scutum that forms a double star with the Wolf-Rayet star WR 114.
== Features ==

This star, of spectral type M7, is highly notable for being one of the very few bow shock-producing red supergiant stars, the two others being Betelgeuse and Mu Cephei, and unlike the two others the bow shock is visible in visible light. Its stellar wind seems to be ionized too by the stars of the cluster NGC 6611 and/or the nearby (in the sky) Wolf-Rayet star WR 114.
Its distance is not very well known, but it is estimated to be of the order of 2 kiloparsecs on the basis its parallax and closeness of this star to the open clusters and star formation regions NGC 6604, Eagle Nebula, and the Omega Nebula (the three sharing a similar distance to the Sun, of around 2 kiloparsecs too);〔 the studies of the water masers that surround her suggest a higher distance, up to around 3 kiloparsecs. However, the birthplace of this star is not clear and its kinematics and age show its unlikely it had formed in any of the previous three star-forming regions mentioned.〔
Assuming the distance given above and a surface temperature of 3,300K, IRC-10414 is 160,000 times brighter than the Sun and its diameter in the order of 1,200 times the solar one, which places this star among the largest known. Stellar evolution models suggest in that case an initial mass between 20 and 25 solar masses and an age between 6 and 10 million years.〔

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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