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

¹ Beijing Astronomical Observatory, Datun Rd. 20A, Chaoyang, Beijing 100012, PR China
² The Department of Physics, Normal University of Central China, Wuhan, Hubei 430079, PR China

Corresponding author: Y. Lu, ly@yac.bao.ac.cn

Received: 11 August 2000
Accepted: 18 December 2000

Abstract

A model of supernova-driven chemical evolution of the Galactic halo proposed by Tsujimoto et al. ([CITE]) (TSY) is used to investigate the observations of the first generation stars (FGS). We assume in this paper that a star with a metallicity 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 . We find a metallicity distribution function (MDF) of the long-lived halo field stars for 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 , our model suggests that the probability of identifying FGS in the halo is about 6.14 10^-5 to 6.14 10^-6.