LARGE TURBULENT ELEMENTS IN SUPER-GIANT PHOTOSPHERES

被引:7
作者
DEJAGER, C
VERMUE, J
机构
[1] The Astronomical Institute, Utrecht
关键词
D O I
10.1007/BF00643919
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
During the 'cool phase' of the super-supergiant HR 8752, which happened around 1973, when the star's spectral type was K2...K5 Ia+, the most probable vertical extent of the main turbulent elements in the star's photosphere was about 6 times the density scale height, which is about half the stellar radius. In early-type photospheres (class Ia) it is about 10 times the atmospheric density scale height (about 0.25 of the stellar radius), while in less extreme (luminosity class Ib) medium-type supergiants the most probable vertical extent of the elements is approx. 8 times the density scale height (≈0.05 R). Large turbulent elements are apparently a common feature in supergiant photospheres; the more extreme the supergiant the larger the relative size of the eddies. © 1979 D. Reidel Publishing Co.
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页码:245 / 250
页数:6
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