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Probing the Formation of the First Low-Mass Stars with Stellar Archaeology | | Anna Frebel
; Jarrett L. Johnson
; Volker Bromm
; | | Date: |
12 Jan 2007 | | Abstract: | We investigate the conditions under which the first low-mass stars formed in the universe by confronting theoretical predictions governing the transition from massive Population III to low-mass Population II stars with recent observational C and/or O abundance data of metal-poor Galactic stars. We introduce a new function, the transition discriminant D_trans, which allows powerful comparisons between samples of halo stars and theoretical predictions of the formation of the first low-mass stars (< 1 M_sun). Specifically, we test the theory that fine-structure lines of C and O dominate the transition from Pop III to Pop II in the early universe. We find the observational data for halo stars as well as for dSph galaxies and globular clusters to be consistent with this theory. An explanation for the observed lack of metal-poor stars in dSph galaxies and globular clusters is also suggested. Finally, we predict that any star to be found with [Fe/H]<-4 should have enhanced C and/or O abundances. The high C and O abundances of the two most iron-poor stars are in line with our prediction. | | Source: | arXiv, astro-ph/0701395 | | Services: | Forum | Review | PDF | Favorites | |
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