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Titolo:
Consistency and prediction in stellar evolutionary theory
Autore:
Arnett, D;
Indirizzi:
Univ Arizona, Steward Observ, Tucson, AZ 85721 USA Univ Arizona Tucson AZUSA 85721 na, Steward Observ, Tucson, AZ 85721 USA
Titolo Testata:
NUCLEAR PHYSICS A
fascicolo: 1-2, volume: 688, anno: 2001,
pagine: 177C - 184C
SICI:
0375-9474(20010521)688:1-2<177C:CAPISE>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Arnett, D Univ Arizona, Steward Observ, Tucson, AZ 85721 USA Univ ArizonaTucson AZ USA 85721 d Observ, Tucson, AZ 85721 USA
Citazione:
D. Arnett, "Consistency and prediction in stellar evolutionary theory", NUCL PHYS A, 688(1-2), 2001, pp. 177C-184C

Abstract

Karl Popper argued that science progresses by inconsistency, that is, by falsification of hypotheses. Phenomenology hides inconsistency by parameter adjustment, and is an impediment to the recognition of inconsistency. Nevertheless, in the face of inadequate knowledge phenomenology may allow some progress to be made. Stellar evolution theory is an example, in which inadequate input physics has been calibrated by adjusting parameters: traditionally, the convective mixing length and the precise abundance of helium and heavier elements ("metals") are chosen so that, at the age of the solar system, a one solar mass model would have solar luminosity and radius. Our understanding of stellar evolution, one of the great successes of astrophysical theory, has been based on this calibration. However, to have a predictive theory, it is desirable to cleanly separate input physics from astronomical tests. Stellar evolution theory rests largely upon knowledge of a combination of nuclear reaction rates, radiative opacities, and hydrodynamics. Willy Fowler has taught this community the value of experimental nuclear astrophysics. New developments in these other areas promise to help us solve the whole problem of how stars behave.

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Documento generato il 26/11/20 alle ore 09:04:49