The probability of detecting first generation stars of the Galaxy

Details The probability of detecting first generation stars of the Galaxy The probability of detecting first generation stars of the Galaxy

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cha%26a..25..432c&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 25, Issue 4, p. 432-438.

Astronomy and Astrophysics

Astrophysics

Galactic Halo, Model Of Chemical Evolution, Population Iii Stars, Initial Mass Function

Scientific paper

First generation stars are the oldest stars that were formed in post-big bang, primitive gas, containing no elements heavier than carbon, with ages greater than 14 Gyr and having undergone no evolution so far. Observations over a long time have confirmed that, up to now, no stars with zero metallicity ([Fe/H]) or with [Fe/H]<= -6 have been found in the Galaxy. To explain this absence, we shall make a theoretical calculation of the probability of detecting first generation stars using Tsuiimoto et al.'s model of chemical evolution of the galactic halo and assuming an initial mass function of the Miller-Scalo form. We use all the observational data on the halo stars to constrain the parameters. Our result is that, if the mass of the cloud that formed the stars is 106-107 Msolar, then the probability of detecting first generation stars is 6.14×10-4-6.14×10-5.

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