| 单词 | subdwarf star |
| 释义 | > as lemmassubdwarf star 2. Astronomy. A star which lies just below the main sequence on the Hertzsprung–Russell diagram, being less luminous than main sequence stars of the same temperature or spectral type. Also subdwarf star. Cf. dwarf n. 2c, subgiant n. ΘΚΠ the world > the universe > star > kind of star > small star > [noun] > subdwarf subdwarf1939 1939 G. P. Kuiper in Astrophysical Jrnl. 89 548 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’. 1961 Sci. News Let. 21 Oct. 272/2 Subdwarf stars may have planets far beyond the limits of the ecosphere. 1962 New Scientist 3 May 218/2 Some hot subdwarfs are found from their spectra to have helium but virtually no hydrogen. 1981 Nature 8 Oct. 432/2 The most likely explanation..is that the atmospheres are untypical of the subdwarf stars as a whole. 2005 I. N. Reid & S. L. Hawley New Light Dark Stars (ed. 2) ii. 77 The latest subdwarfs are redder than disk dwarfs with similar absolute magnitudes. < as lemmas |
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