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A star that lies appreciably below the main sequence on the Hertzsprung–Russell diagram, and is somewhat bluer (i.e. of earlier spectral type) than a main-sequence star of the same luminosity; abbr. sd. Subdwarfs belong to Population II, being stars from the galactic halo which are passing through the solar neighbourhood. Their spectral types range from F to M and they differ from normal dwarfs in having a low abundance of heavy elements.

Subjects: Astronomy and Astrophysics.

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