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ˈsubdwarf, n. and a. Astr.
[sub- 23.]
A. n. A star which when plotted on the Hertzsprung–Russell diagram lies just below the main sequence, being less luminous than dwarf stars of the same temperature. Cf. subgiant.
1939G. P. Kuiper in Astrophysical Jrnl. LXXXIX. 548 Three classes of objects of special interest are expected to be found..: (1) white dwarfs; (2) intermediate white dwarfs or, more generally, stars not over 2 or 3 mag. below the main sequence... The second group extends almost along the whole main sequence. Since these stars merge into the main sequence and are much more similar to main-sequence stars than to white dwarfs.., the name ‘subdwarfs’ is suggested for this class of stars, in analogy with ‘subgiants’. 1962New Scientist 3 May 218/2 Some hot subdwarfs are found from their spectra to have helium but virtually no hydrogen. 1979Nature 24 May 305/1 The observations of CH Cygni reported here were made to determine whether a symbiotic star is a binary system composed of an M6 giant and a hot subdwarf, or whether it is a cool star surrounded by a thick corona.
B. adj. Designating such a star.
1981Nature 8 Oct. 432/2 The most likely explanation..is that the atmospheres are untypical of the subdwarf stars as a whole. |