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: http://star.arm.ac.uk/annrep/annrep2003/node57.html
Дата изменения: Tue May 18 17:48:07 2004 Дата индексирования: Tue Oct 2 05:03:40 2012 Кодировка: Поисковые слова: annular solar eclipse |
After formation, stars spend the major part of their lives converting
hydrogen to helium in their cores. Since the colours and brightnesses of
such stars follow a simple relation, the vast majority of stars are known
as `main sequence' stars. Their surfaces are frequently seen to vibrate, a
property which enables astronomers to deduce information about their
interiors. Simon Jeffery and Myron Smith (Space Telescope Science
Institute, Baltimore, USA) have continued to study the physics of surface
oscillations in the Cepheid star BWVul. They are investigating
empirically how a shock wave can affect the temperature and density
structure of a stellar atmosphere as it passes through.