| 单词 | giant branch |
| 释义 | > as lemmasgiant branch giant branch n. Astronomy a region extending above and to the right of the main sequence, where giant stars are plotted in a Hertzsprung–Russell diagram. ΚΠ 1922 Sci. Monthly May 491/2 We thus have the so-called giant and dwarf subdivisions of stars, a grouping which shows most clearly among the stars of lowest temperature.] 1928 J. H. Jeans Astron. & Cosmogony vi. 176 A sudden shrinkage occurs when a star reaches the unstable edge of the giant branch and suddenly drops down to the main sequence. 1989 M. Longair in P. Davies New Physics vi. 111/1 Extending from about the location of the Sun on the luminosity-temperature diagram up towards the top right is what is known as the giant branch. 2001 Nature 5 July 51/1 There is also clear evidence of a large metallicity spread in the giant branch, with a mean just below solar, supporting a prolonged star-forming epoch. < as lemmas |
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