Pregalactic-primordial low-mass stars |
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Authors: | N Kizilo?lu D Eryurt-Ezer |
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Institution: | (1) Physics Department, Middle East Technical University, Ankara, Turkey |
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Abstract: | The Main-Sequence positions as well as the evolutionary behavior of Population III stars up to an evolution age of 2×1010 yr, taking this time as the age of the Universe, have been investigated in the mass range 0.2 and 0.8M
. While Population III stars with masses greater than 0.3M
develop a radiative core during the approach to the Main Sequence, stars with masses smaller than 0.3M
reach the Main Sequence as a wholly convective stars. Population III stars with masses greater than 0.5M
show a brightening of at most 2.2 in bolometric magnitude when the evolution is terminated as compared to the value which corresponds to zero-age Main Sequence. The positions of stars with masses smaller than 0.5M
remain almost the same in the H-R diagram.If Population III stars have formed over a range of redshifts, 6m. |
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