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HD 130144
HD 130144 (or EK Boötis) is a semiregular variable star in the northern constellation of Boötes. The variation in luminosity has an amplitude of 0.38 in magnitude with no apparent periodicity. This is an X-ray source, and was possibly the first M-type giant star to have a magnetic field directly detected. It is considered to be a single star,〔 although there is nearby companion at an angular separation of 0.2023″ along a position angle of 82.2° (as of 2010.4812).〔
==References==
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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