Computer Science – Sound
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..571y&link_type=abstract
In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,
Computer Science
Sound
1
Helioseismology, Solar Models
Scientific paper
Helioseismology puts very important constraints on the solar models, which can not be available by another way. Surface helium abundance and base radius of the convective zone are known very precisely from inversion of p-mode oscillations. Also from inversion, almost from center to surface of the Sun, the sound speed was accurately determined. In this study, in the light of these constraints, two tests are done on the solar models. In the first test we assume that the convective parameter was larger than the present value, and, in that case, sound speed difference between the standard solar models and the Sun just beneath the convective zone can be removed. In the second test, we assume that the Sun rotated with a certain value of angular momentum up to a time, and, after this time, it lost its whole angular momentum. The result of this test implies that, for a significant time after ZAMS, the central region of the Sun rotated faster than the outer regions and we can get further information about the angular momentum evolution of the Sun by comparing the sound speed differences between models and the Sun.
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