An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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DO white dwarf
  سفید‌کوتوله‌ی ِ DO  
sefid kutule-ye DO
Fr.: naine blanche DO  

A → white dwarf whose spectrum shows strong lines of singly ionized helium He II; He I or H may be present. As a DO star cools, the He II will recombine with free electrons to form He I, eventually changing the DO type into a DB white dwarf.

See also: D short for → dwarf; O a convention; → white.