a small, old, relatively cool star; approximately 100 times the mass of Jupiter
red dwarf的用法和樣例：
例句
The rising red dwarf star shows expected stellar magnetic activity which includes dramatic and violent prominences. 上升中的紅矮星有著可預期的磁場活動，包含了激烈的日珥現象。
The characteristics of the lensing event show that the planet is in a Jupiter-sized orbit around its parent red star. 這個透鏡現象的特徵顯示出，行星以雙紅矮星為中心的運行軌跡與木星的軌跡類似。
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