| 单词 | spectral type |
| 释义 | > as lemmasspectral type spectral type n. (Astr.), any of the types used to classify stellar spectra, each being associated with stars of a characteristic range of temperatures and compositions and designated by a letter or letters. ΘΚΠ the world > the universe > star > star-matter > [noun] > spectrum spectral type1890 redshift1923 space reddening1931 profile1933 1890 A. M. Clerke Syst. Stars iii. 37 About eleven-twelfths of all the stars show linear spectra of absorption. They fall into two great divisions, corresponding to Father Secchi's first and second spectral types. 1924 Proc. Amer. Acad. Arts & Sci. 59 217 If the stellar density for any spectral type were uniform throughout space, the number of stars visible should double with every increase of half a magnitude in brightness. 1973 Smith & Jacobs Introd. Astron. & Astrophysics x. 268 Since we will have occasion to refer to specific spectral types in the following paragraphs, we give the spectral sequence from hot to cool stars (40,000 K to 3000 K) here: O, B, A, F, G, K, and M. Each spectral class is further divided into ten sub~classes 0 to 9. < as lemmas |
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