Determining the helium abundance of stellar envelopes

Details Determining the helium abundance of stellar envelopes Determining the helium abundance of stellar envelopes

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.538..273b&link_type=abstract

In: Second Eddington Workshop: Stellar structure and habitable planet finding, 9 - 11 April 2003, Palermo, Italy. Edited by F. F

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Stars: Oscillations, Stars: Abundances

Scientific paper

Intermediate-degree mode solar oscillation have been used to determine the solar helium abundance to a high degree of precision. However, we cannot expect to observe these modes in other stars. We investigate whether low degree modes that should be available from space-based asteroseismology missions can be used to determine the helium abundance with sufficient precision. We find that the oscillatory signal in the frequencies caused by the depression in Γ1 in the second helium ionisation zone can be used to determine the envelope helium abundance of low mass stars.

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