Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..322s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 1, 1984, p. 322-326.
Astronomy and Astrophysics
Astrophysics
48
Astrophysics, Convective Heat Transfer, Stellar Models, Stellar Oscillations, Variable Stars, Abundance, Helium, Hydrogen, Stellar Activity
Scientific paper
The pulsational stability of nonlinear convective RR Lyrae models has been determined for a range of effective temperatures, fundamental and first-overtone modes, and helium abundances of Y = 0.2 and Y = 0.3. An instability strip of width 1200 K at Y = 0.3 and 1000 K at Y = 0.2, both consistent with observations, is found. The first-overtone red edge is found to be 300-400 K bluer than the fundamental red edge, resulting in a narrower first-overtone strip. Convective blue edges lie to the blue of the radiative blue edges by 100 K at Y = 0.3 and 300 K at Y = 0.2. This unexpected convective destabilization near the blue edge seems to be due to increased driving in the hydrogen ionization zone, which causes a weaker dependence on helium abundance than found in the radiative models.
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