Dwarf Spheroidals and the Evolution of Not-Too-Old Population II Stars

Details Dwarf Spheroidals and the Evolution of Not-Too-Old Population II Stars Dwarf Spheroidals and the Evolution of Not-Too-Old Population II Stars

1994-06-21

arxiv.org/abs/astro-ph/9406058v2

Astronomy and Astrophysics

Astrophysics

postscript file of 10 pages plus 2 tables 3 figures will be added later as postscript file The latex file and the other two no

Scientific paper

Previous evolutionary computations concerning stars with masses in the range of the ``Red Giants Transition Phase'' are extended to lower metallicities. Clusters isochrones for two values of the metallicity Z (Z=10E-4, 4E-4) and for ages down to 1 billion years are presented, discussing selected evolutionary features characterizing the structure of the stars during both H or He burning phases. One finds that clusters with Z about equal to 1E-4 an age around 1-2 billion years could be characterized by the occurrence of anomalous He burning variables at a luminosity of the order of LogL= 2.0-2.2 (in solar units).

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