| 单词 | a-star |
| 释义 | > as lemmasA-star A-star n. British Education a grade awarded in GCSE and A-level examinations (from 1994 and 2008 respectively) for performance exceeding the standards denoted by an ordinary A (also written A*). ΚΠ 1994 Scotsman 3 Sept. 3/3 Of the top 50 British schools obtaining most A and new A-star grades, 34 were single-sex girls' schools. 2001 Observer 18 Mar. (Britain Uncovered Suppl.) 60/1 We thought he was no good at French but he got an A-star. 2009 S. Faulks Week in December 22 Although the pupils regularly came near the top of the national league of exam results, most taking home a full house of A-stars and A's, they had little idea of spelling or grammar. A-star 10. Astronomy. In form A. In the classification system of stellar spectra: the division comprising spectra characterized by prominent Balmer hydrogen absorption lines. Also (esp. in A-star, A-type star): designating a white star with a surface temperature of approx. 7500–11,000 K which emits such a spectrum. ΚΠ 1890 E. C. Pickering Draper Catal. Stellar Spectra in Ann. Astron. Observatory Harvard Coll. 27 2 When no other lines but those named above are visible the spectrum is indicated by the letter A. 1942 W. M. Smart Found. Astron. xii. 211 Stars belonging to a particular type or class, say A, are sub-divided as A0, A1, A2..A9. 1984 Chinese Astron. & Astrophysics 63 We found the main component to have spectral type A5V. 1994 Observatory 114 77 The Φ values of young neutron stars and magnetic white dwarfs are comparable to those of magnetic A-stars. 2006 Nature 13 Apr. 873/1 In the standard Morgan–Keenan system, which classifies stars into types O, B, A, F, G, K and M in order of decreasing temperature, Vega is the archetypal A-type star. < as lemmas |
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