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The probability of detecting first generation stars of the Galaxy |
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| Authors: | Cen Min-rui Lu Ye Zhao Gang |
| Institution: | a Department of Physics, Huazhong Normal University, Wuhan 430079 China b National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 China |
| Abstract: | 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 M , then the probability of detecting first generation stars is 6.14×10?4–6.14×10?5. |
| Keywords: | Galactic halo—model of chemical evolution—Population III stars—initial mass function |
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