Upsilon Sagittarii
- 建六（人马座建六是一个分光双星系统，属于缺氢双星，仅有四对类似天体。其光谱不寻常，难以进行光谱分型）
Upsilon Sagittarii
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abstract:
Upsilon Sagittarii (Upsilon Sgr, υ Sagittarii, υ Sgr) is a spectroscopic binary star system in the constellation Sagittarius. Upsilon Sagittarii is the prototypical hydrogen-deficient binary (HdB), and one of only four such systems known.
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