EDP Sciences
Free access
Volume 366, Number 1, January IV 2001
Page(s) 311 - 316
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20000290

A&A 366, 311-316 (2001)
DOI: 10.1051/0004-6361:20000290

Solar model: Element diffusion or metal-enhanced envelope?

J. Y. Yang, Y. Li and H. Y. Xu

Yunnan Observatory, NAOCAS, PO Box 110, Kunming 650011, PR China

(Received 16 December 1998 / Accepted 4 October 2000)

Solar models with moderate enrichment of heavy elements in the convective envelope (CSM) and with element diffusion (DSM) are investigated using updated input physics. It is found that both CSM and DSM can result in adequate depth of the convection zone and appropriate surface helium abundance, and the agreement between the calculated and observed p-mode frequencies are also improved. The sound speed of DSM is better than CSM and the standard solar model (SSM) in the deep interior, which means that element diffusion helps improve the sound speed profile in the solar interior. In the area just below the base of the convection zone, CSM is the best of the three models.

Key words: solar structure -- solar evolution -- solar oscillations

Offprint request: J. Y. Yang

© ESO 2001