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Über den Aufbau von Sternen der unteren Hauptreihe
Author(s) -
Fritze K.
Publication year - 1971
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.19712930411
Subject(s) - ionization , physics , hertzsprung–russell diagram , astrophysics , luminosity , thermodynamics , stellar evolution , ion , quantum mechanics , stars , galaxy
Models of 0.6, 0.8 and 1.0 ⊙ are computed for two chemical compositions ( X = 0.602, Z = 0.044 and X = 0.900, Z = 0.001) representing the extreme populations I and II, and several values of the mixinglength‐parameter α. Particular attention is paid to the treatment of ionisation equilibrium in the outer convection zone. The lowering of ionisation potential by pressure ionisation as well as the influence of metals on the electron pressure is taken into account. Theoretical Hertzsprung‐Russell‐ and mass‐luminosity‐diagrams are compared with observations.