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Qualitative explanations for red giant formation
Bhaskar, R.; Nigam, Anil
AA(IBM Thomas J. Watson Research Center, Yorktown Heights, NY), AB(IBM Thomas J. Watson Research Center, Yorktown Heights, NY)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 10, 1991, p. 592-596. (ApJ Homepage)
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NASA/STI Keywords:
Computational Astrophysics, Red Giant Stars, Star Formation, Stellar Interiors, Radiative Transfer, Stellar Envelopes, Stellar Luminosity, Stellar Models
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Recent research on giant formation has focused on the need for qualitative explanations. The explanations have the following general, qualitative form: the polytrope n assumes a certain value, that makes (d ln r)/(d ln z) take on a very large value; large increases in r can then be explained in terms of small changes in the variable z. This form is applicable to all the explanations current in the literature: they all have (1) either implicitly or explicitly, both a hydrostatic component and a luminosity-opacity component, and (2) a reliance on singular solutions. Dimensional analysis reveals that power laws that assume the polytrope n to 5 are identical in both the hydrostatic and luminosity-based explanations.

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Database: Astronomy
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