Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278..981a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 278, Issue 4, pp. 981-984.
Astronomy and Astrophysics
Astronomy
12
Convection, Stars: Evolution, White Dwarfs
Scientific paper
We compute the evolution of DB (helium-rich envelope) white dwarf models with masses between 0.4 and 1M_solar and metallicities of Z=0.001 and 0.004, taking into account Canuto & Mazzitelli's new theory of convection. This theory, which has no free parameters and includes the full spectrum of turbulent eddies, has been successfully tested in different stellar objects and represents a substantial improvement compared with the classical mixing length theory used in most white dwarf studies. Using thermal time-scales we find that, for the range of masses and metallicities assumed in this study, the Canuto & Mazzitelli theory yields theoretical blue edges between 24200 and 25600K, which is in good aggreement with observations of pulsating DB white dwarfs. Calculations are performed considering the mixing length theory as well. In this context, our results are consistent with previous computations.
Althaus Leandro G.
Benvenuto Omar G.
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