次矮星,有时标示为sd,是约克光谱分类系统中光度属于VI的恒星,它们是绝对星等的光度比主序星低1.5至2等,但光谱型态相同的恒星。在赫罗图上,次矮星的位置在主序带的下方。 次矮星这个名词是古柏在1939年创造的,是用来标示之前被称为"中继白矮星 ",却有着异常光谱的恒星"
大约每过20年红巨星向它的白矮伴星上输出足够的氢气在白矮星表面产生一次耀眼的热核爆炸。
Every 20 years or so the red giant star dumps enough hydrogen gas onto its companion White Dwarf star to set off a brilliant thermonuclear explosion on the White Dwarf's surface.
这第二次预言在当天晚上实现了,化装成老鼠的小矮星彼得逃走去阿尔巴尼亚寻找被击败的伏地魔。
This second prophecy came true that evening when Peter Pettigrew, who had been masquerading as a rat, escaped and went to Albania to find the vanquished Voldemort.
该探测器有史以来第一次发现矮星系可以仅仅依靠原始气体形成,这些原始气体可能是早期宇宙的遗留产物。
The spacecraft has, for the first time, identified dwarf galaxies forming out of nothing more than pristine gas likely leftover from the early universe.
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