[mesa-users] Derivatives of eps_nuc in massive evolved models

Mon Aug 8 07:54:45 EDT 2011

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Dear MESA users,
Hello.
I have a question about the reliability
of a plot I made with MESA output. This corresponds to a model of ~19 Msun
evolved to blue supergiant phase.

In the attachment, there is a
plot of run of nuclear energy-related profiles. In the top panel, they are
nuclear energy generation rate, eps_nuc, neutrino energy loss,
gravitational energy (from contraction/expansion), and the net energy
released. In the bottom panel, there are two derivatives of eps_nuc with
respect to temperature and density:
eps_T = ( dln\eps / dlnT ),
eps_rho = ( dln\eps / dlnRho )

eps_T has a desired value of
11 to 14 in the Hydrogen burning shell. However, interior to this zone
where there is He burning in the core, and also exterior to this zone
where there is no burning in the envelope, eps_T takes large values.

I just like to know if what I find here is already stablished in
the literature.

Thanks for your concern.

Moravveji,
Ehsan.
Ph.D student of Astrophysics.
Department of Physics,
Institute for Advanced Studies in Basic Sciences (IASBS), GavaZang Road,

Zanjan 45137-66731, Iran.

Office: (+98)241-415 2118
Fax:    (+98)241-415 2104
http://iasbs.ac.ir/students/moravveji

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