Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.136...83k&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 136, no. 1, Aug. 1987, p. 83-90.
Astronomy and Astrophysics
Astrophysics
1
Equations Of State, Main Sequence Stars, Stellar Evolution, Stellar Mass, Helium, Red Shift, Stellar Luminosity, Stellar Models
Scientific paper
The main-sequence positions as well as the evolutionary behavior of Population III stars up to an evolution age of 2×1010yr, taking this time as the age of the Universe, have been investigated in the mass range 0.2 and 0.8 M_sun;. While Population III stars with masses greater than 0.3 M_sun; develop a radiative core during the approach to the main sequence, stars with masses smaller than 0.3 M_sun; reach the main sequence as wholly convective stars. Population III stars with masses greater than 0.5 M_sun; 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 0.5 M_sun; remain almost the same in the H-R diagram. If Population III stars have formed over a range of redshifts, 6 < Z < 1500, the original starlight of low-mass Population III stars could now be part of infrared and/or microwave background spectrum between 7 and 1400 μm.
Eryurt-Ezer Dilhan
Kiziloglu Nilgun
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