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By Jørgen Christensen-Dalsgaard (auth.), Jørgen Christensen-Dalsgaard, Søren Frandsen (eds.)

Helio- and asteroseismology research the internal of the solar and different stars, via observations of oscillations on their surfaces. The final 10 years within the research of the sunlight inside, to a has witnessed a truly quick evolution element the place we will now think about investigating the actual nation of subject, or the main points of rotation and different large-scale movement, within the sunlight. The stellar reports are in a few respects on the aspect of the sun reviews 10 years in the past, yet seem poised to take off. hence the time used to be deemed ripe for lAO Symposium No 123, to evaluate the current prestige of this paintings, and plan for its destiny improvement. except the seismic information, few observations can be found to supply information regarding stellar interiors. designated experiences, via spectral research, should be made from stellar floor houses, together with atmospheric temperature and chemical composition. besides the fact that, the stellar radiative spectrum is sort of completely mounted by means of the mass, luminosity, radius and floor rotation of the big name, and includes primarily no different information regarding the inner. a big try of stellar evolution conception is equipped by way of observations of stel­ lar clusters, whose participants can kind of be assumed to have an identical age and chemical composition. the positioning of such stars in a HR diagram, the place luminosity is plotted opposed to the powerful temperature, can approximately be understood by way of stellar evolution calculations.

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J. M. Wilcox, A. B. Sevemy. V. A. Kotov. and T. T. Tsap. Ap. J. 3 (1980). L97L98. Philip H. Scherrer, John M. Wilcox. J. Christensen-Dalsgaard, and D. O. Gough. Sol. Phys. 82(1983). 75-87. Philip H. Scherrer and John M. Wilcox, Sol. Phys. 82(1983), 37-42. B. Sevemy. T. Tsap. Nature 259(January 1976). 87-95. Martin F. Woodard and Robert W. Noyes. Nature 318(1985). 449-450. Tsap Crimean Astrophysical Observatory Nauchny, Crimea 334413 USSR ABSTRACT. The Earth atmospheric pressure fluctuations in the 5-min range of periods are analysed and their influence on observations of solar 5-min oscillations are briefly discussed.

Posiua. The figure 3 is a cODlparison of the p-mode frequencies Dleasured here with the saDle frequencies obtained froDl the SHH-ACRIH data in 1980 (Woodard and Hudson, 1983) . g. in the two here above referenced papers, the Dlean width of individual peaks in the five Dlinute range is of the order of 1 or 2 ,11Hz. 4 ,11Hz. It SiDlply Dleans that it is difficult to locate more precisely the centroids of peaks without having an infinite duration of data. In the case of SHH-ACRIH data of 1980, the duration (10 Dlonths) was significantly closer to infinity than in any other observation.

W. & Rhodes, E. , 1985b. NatuTe, 315, 378. , Isaak, G. , McLeod, C. , van der Raay, H. B. , 1979. , Isaak, G. , McLeod, C. , van der Raay, H. , Palle, P. L. , 1984. Mem. Soc. AstTon. , 55, 63. -L. , 1984. Ann. Rev. AstTon. , 22, 593. , Ulrich, R. K. & Rhodes, E. , 1979. AstTon. , 72, 177. 18 1. CHRISTENSEN-DALSGAARD Duvall, T. , 1982. Nature, 300, 242. Duvall, T. L. & Harvey, J. , 1983. Nature, 302, 24. Duvall, T. L. & Harvey, J. , 1984. Nature, 310, 19. Duvall, T. , Dziembowski, W. , Goode, P.

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