By Jørgen Christensen-Dalsgaard (auth.), Jørgen Christensen-Dalsgaard, Søren Frandsen (eds.)
Helio- and asteroseismology research the inner of the solar and different stars, by way of observations of oscillations on their surfaces. The final 10 years within the learn of the sun inside, to a has witnessed a truly quick evolution aspect the place we will be able to now examine investigating the actual country of subject, or the main points of rotation and different large-scale movement, within the sunlight. The stellar stories are in a few respects on the aspect of the sunlight reviews 10 years in the past, yet look poised to take off. therefore the time was once 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. specific reports, through spectral research, should be made from stellar floor homes, together with atmospheric temperature and chemical composition. despite the fact that, the stellar radiative spectrum is sort of completely mounted via the mass, luminosity, radius and floor rotation of the famous person, and comprises basically no different information regarding the internal. a big try out of stellar evolution thought is equipped by means of observations of stel lar clusters, whose participants can kind of be assumed to have an analogous age and chemical composition. the site of such stars in a HR diagram, the place luminosity is plotted opposed to the potent temperature, can approximately be understood by way of stellar evolution calculations.
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Extra resources for Advances in Helio- and Asteroseismology: Proceedings of the 123th Symposium of the International Astronomical Union, Held in Aarhus, Denmark, July 7–11, 1986
F21i radians. Observations of the splittings of the latter modes therefore provide 15 AN OVERVIEW OF HELlO- AND ASTEROSEISMOLOGY measurements of the equatorial rotation inside the Sun. - In general, observation of tU/nlm at all m should allow determination of the variation of n with latitude. 4. SOME HELIOSEISMIC RESULTS. A detailed review of the results of helioseismology is outside the scope of the present paper. Instead I present a few selected results on three key aspects of the solar interior: the structure of the solar core, the sound speed in the Sun and the solar internal rotation.
Starting from 1983 the registration of the Earth atmospheric pressure was carried out simultaneously with the patrol Doppler observations. , . lIU • fUU ' ·0 '" I,U't-" . ".. _St ... , .. 0 100 tt,I UI ~ I/, Hz l Figure 3. ) and 1984 (~). , Figure 2) with evident concentration of power within relatively narrow frequency band. A careful consideration of these PS showed that only 20% of peaks from both spectra coincide with the accuracy +5 microHz; frequencies of the rest of the peaks differ oy more than 30 microHz.
01 IdIZ is obtained fn:. the 1982 data. This could possibly be related to the intense solar activity occurring during this year where the appearance and disappearance of allPlitude modulating surface features could well distort the deduced surface rotation rate. As for the splitt1ngs ascribeCl to internal rotation, these show some systematiC behaviour; a sudden drop virtually coincident with the solar activity increase followed by a gradual increase. one interpretation is that of a redistribution of the inner MSS of tbe sun to larger radii with a consequent decrease in internal rotation rate tbus JIa1ntaining a constant angular mcmentua.