| 单词 | main-sequence turn-off |
| 释义 | > as lemmasmain-sequence turn-off main-sequence turn-off n. Astronomy (more fully main-sequence turn-off point) the point on a Hertzsprung–Russell diagram beyond which all brighter stars have left the main sequence and have started to evolve into giants. ΚΠ 1952 Astrophysical Jrnl. 116 474 The evolution to the right sets in rather sharply for any given star. Hence one should expect a fairly well-defined turnoff point in the H-R diagrams.] 1962 P. G. Murdin in J. G. Porter & P. Moore Yearbk. Astron. 1963 150 (caption) The age corresponding to various Main Sequence turn-off points is along the right hand ordinate. 1978 Internat. Astron. Union Symp. 80 335 The CNO abundance can significantly influence the characteristics of the main-sequence turnoff. 1992 S. P. Maran Astron. & Astrophysics Encycl. 238/2 Indicators of an intermediate age population include the presence of asymptotic giant branch (AGB) carbon stars, anomalous Cepheid variable stars, and an overluminous main sequence turnoff. < as lemmas |
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