Subdvärg

Subdvärg, ibland betecknad med "sd", är en stjärna med spektraltyp VI enligt Yerkes stjärnklassificering. De definieras som stjärnor med en ljusstyrka på 1,5 till 2 magnituder lägre än för huvudsekvensstjärnor av samma spektraltyp. På ett Hertzsprung–Russell-diagram verkar subdvärgar ligga under huvudsekvensen.

Termen "dvärg" myntades av Gerard Kuiper 1939 för att hänvisa till en serie stjärnor med avvikande spektra som tidigare märktes som "mellanliggande vita dvärgar".[1]

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  1. ^ Ken Croswell, The Alchemy of the Heavens, Oxford: Oxford University Press, 1995, sid. 87.

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