On the sensitivity of high-degree p-mode frequencies to the solar convection zone helium abundance

Details On the sensitivity of high-degree p-mode frequencies to the solar convection zone helium abundance On the sensitivity of high-degree p-mode frequencies to the solar convection zone helium abundance

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386..729g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 20, 1992, p. 729-733.

Astronomy and Astrophysics

Astrophysics

23

Abundance, Convection, Helium, Solar Interior, Solar Oscillations, Equations Of State, Frequency Distribution, Magnetohydrodynamics, Opacity, Stellar Models

Scientific paper

Nonadiabatic frequencies for modes of degree l = 200-1000 for the MHD equation of state model described in Guzik and Cox (1991) with a convection zone Y = 0.27 are compared with a model with Y = 0.24, corresponding to the decrease expected due to diffusion. The frequencies of the l = 300-600 modes, which sample best the helium ionization region, show the greatest sensitivity to this helium abundance change. The frequency sensitivity to helium abundances is not affected by changes in the mixing-length/pressure scale height ratio or the inclusion of the turbulent pressure, although these effects can alter considerably the upper convection zone structure and the calculated frequencies. The observed minus calculated frequency differences for these high-degree low-order modes are discussed. The O - C differences for the accurately observed modes favor a reduction in the convection zone helium mass fraction of about 0.3, consistent with that expected due to diffusion.

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