Research Papers in Physics and Astronomy


Date of this Version

December 1984


Published in The Astrophysical Journal 203 ApJ 287, 261 (1984). Published by the University of Chicago Press; copyright © 1984 American Astronomical Society; reproduced by permission of the AAS.


Luminosities and effective temperatures are calculated for 17 nonvariable yellow giants and supergiants and nine Cepheids which were previously identified as members of open clusters. These stars are identified as being in the helium core burning stage of evolution. A comparison with the predictions of pulsation theory does not show any disagreement. On the other hand, several comparisons with the theory of stellar evolution produce discrepancies which suggest that effects neglected in the calculations may play an important role in the evolution of these stars.

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