Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..128..143g&link_type=abstract
(IAU, The Inside the Sun Colloquium, 121st, Versailles, France, May 22-26, 1989) Solar Physics (ISSN 0038-0938), vol. 128, July
Physics
31
Acoustic Frequencies, Helioseismology, Stellar Evolution, Eigenvalues, P Waves, Solar Interior, Stellar Luminosity
Scientific paper
The increasing central concentration of the sun with age modifies the acoustic eigenfrequencies. In particular, the frequency separation d(l), for modes with l + 1/2 much less than n decreases as nuclear reactions augment the molecular-weight gradient in the energy-generating core. If, for example, the sun were older than is generally believed, d(l) might therefore be expected to be smaller than current theoretical predictions. On the other hand, to ensure that the luminosity is consistent with observations, the presumed initial hydrogen abundance would need to be enhanced, thereby reducing the resultant molecular-weight gradient. Thus there is some degree of cancellation of the two major factors that determine d(l). It is shown that d(l) diminishes with the presumed age of the sun at the rate of about 1 microhertz per Gy for l = 0; the magnitude of the rate appears to decline with increasing l.
Gough Douglas O.
Novotny Eva
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