spectroscopic binary

基本解释

A spectroscopic binary star, 245 light-years from Earth, one of the brightest stars in the sky and the brightest star in the constellation Virgo.
一種用分光鏡觀察的距地球245光年雙星，是天空中最亮的恒星之一，也是処女座中最亮的星星。
odict.net
In addition, spectroscopic observations with ground-based telescopes further reveal that one of the stars is actually a tight binary that is too compact to be resolved even by Hubble.
另外，地麪望遠鏡的分光鏡觀察結果進一步揭示出它們其中的一顆恒星實際上是一對緊密的雙星組成的，它們距離太近以至於哈勃望遠鏡不能區分出來。