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Pre-MS depletion, accretion and primordial 7Li
P. Molaro, A. Bressan, M. Barbieri +2
We reconsider the role of pre-main sequence (pre-MS) Li depletion on the basis of new observational and theoretical evidence: i) new observations of Halpha emissions in young clust…
Deuterium at high-redshift: Primordial abundance in the zabs = 2.621 damped Ly-alpha system towards CTQ247
P. Noterdaeme, S. López, V. Dumont +3
The detection of neutral deuterium in the low-metallicity damped Lyman-α system at zabs = 2.621 towards the quasar CTQ247 is reported. Using a high signal-to-noise and high spectra…
QSO 0347-383 and the invariance of m_p/m_e in the course of cosmic time
Martin Wendt, Paolo Molaro
The variation of the dimensionless fundamental physical constant mu = m_p/m_e (the proton to electron mass ratio) can be constrained via observation of Lyman and Werner lines of mo…
An extremely primitive halo star
E. Caffau, P. Bonifacio, P. François +11
The early Universe had a chemical composition consisting of hydrogen, helium and traces of lithium1, almost all other elements were created in stars and supernovae. The mass fracti…