Truran and Cameron 1970
Truran, J.W., and A.G.W. Cameron, 1970: The galactic halo. Nature, 225, 710-711, doi:10.1038/225710a0.
The halo of our galaxy is a nearly spherical region containing very old stars which have a smaller content of heavy elements than our Sun. There is no detailed model for its formation. It is usually assumed that somehow a cloud of gas condensed to form our galaxy, and that the halo stars were formed during the collapse process and left with a nearly spherical distribution. In that case, and in view of the success of the theories of nucleosynthesis in stars, it is very puzzling that the halo stars should have any heavy elements at all.
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Truran, J.W., and Cameron, A.G.W.: The galactic halo, Nature, 225, 710-711, doi:10.1038/225710a0, 1970.
Truran, J.W., and A.G.W. Cameron (1970), The galactic halo, Nature, 225, 710-711, doi:10.1038/225710a0.
Truran, J.W., and A.G.W. Cameron, 1970: The galactic halo. Nature, 225, 710-711, doi:10.1038/225710a0.
Truran, J.W., & Cameron, A.G.W. 1970, Nature, 225, 710, doi:10.1038/225710a0.
Truran JW, Cameron AGW. The galactic halo, Nature 1970;225:710-711. doi:10.1038/225710a0.
J.W. Truran, A.G.W. Cameron, Nature 225, 710-711, doi:10.1038/225710a0 (1970).
