| 单词 | o-type star |
| 释义 | > as lemmasO-type star 6. Astronomy. In form O. In the classification system of stellar spectra: the division comprising spectra characterized by strong absorption lines of neutral hydrogen. Also (esp. in O-star, O-type star): designating a very hot blue star with a surface temperature of approx. 28,000–50,000 K which emits such a spectrum. ΚΠ 1890 E. C. Pickering Draper Catal. Stellar Spectra in Ann. Astron. Observatory Harvard Coll. 27 3 The letter O is used for stars whose spectra consist mainly of bright lines. 1926 A. S. Eddington Internal Constit. of Stars vii. 151 The three stars belong to what is now called the ‘main series’ running from types O and B down the dwarf series to type M. 1978 J. M. Pasachoff & M. L. Kutner University Astron. ii. 39 O stars are relatively rare since they have short lifetimes. 1989 Encycl. Brit. XXVIII. 202/2 The O- and B- type stars are intrinsically the bluest and hottest. < as lemmas |
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