An Etymological Dictionary of Astronomy and Astrophysics
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A → spectroscopic binary in which the → spectral lines of both stars are seen and the lines are alternatively double and single. Same as → SB2 binary. See also: → single-lined binary.

→ double; → line; → binary

A → double-lined spectroscopic binary whose → light curve is typical of an → eclipsing binary.

→ double; → line; → eclipsing; → binary.

Same as → double-lined binary.

→ double; → line; → spectroscopic; → binary.