Research Note Prediction for the first generation stars from a Galactic halo chemical evolution model with Miller-Scalo initial mass function

Details Research Note Prediction for the first generation stars from a Galactic halo chemical evolution model with Miller-Scalo initial mass function Research Note Prediction for the first generation stars from a Galactic halo chemical evolution model with Miller-Scalo initial mass function

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...367..277l&link_type=abstract

Astronomy and Astrophysics, v.367, p.277-281 (2001)

Astronomy and Astrophysics

Astrophysics

4

Galaxy: Evolution, Galaxy: Halo-Stars: Abundance, Stars: Formation, Supernovae: General

Scientific paper

A model of supernova-driven chemical evolution of the Galactic halo proposed by Tsujimoto et al. (\cite{Tsuj99}) (TSY) is used to investigate the observations of the first generation stars (FGS). We assume in this paper that a star with a metallicity [Fe/H]<= -6 is truly a FGS. We obtain FGS probabilities with the Miller-Scalo form of the stellar initial mass function and limit our model parameters to values consistent with the observed metallicity distributions of metal-poor stars in the range of -4.0<[Fe/H]<-1.0. We find a metallicity distribution function (MDF) of the long-lived halo field stars for [Fe/H]<-1 against the iron abundance in agreement with the observations. If the star formation in the halo is confined to individual gas clouds with masses from 1 107 to 1 108 Msun, our model suggests that the probability of identifying FGS in the halo is about 6.14 10-5 to 6.14 10-6.

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