Possible signature of hypernova nucleosynthesis in a beryllium rich halo dwarf

Abstract

As part of a large survey of halo and thick disc stars, we found one halo star, HD 106038, exceptionally overabundant in beryllium. In spite of its low metallicity, [Fe/H] = -1.26, the star has log(Be/H) = -10.60, which is similar to the solar meteoritic abundance, log(Be/H) = -10.58. This abundance is more than ten times higher the abundance of stars with similar metallicity and cannot be explained by models of chemical evolution of the Galaxy that include the standard theory of cosmic-ray spallation. No other halo star exhibiting such a beryllium overabundance is known. In addition, overabundances of Li, Si, Ni, Y, and Ba are also observed. We suggest that all these chemical peculiarities, but the Ba abundance, can be simultaneously explained if the star was formed in the vicinity of a hypernova.

Accepted for publication in the MNRAS letters

References in corpus (3)

• Sulphur and zinc abundances in Galactic halo stars revisited
• A Planetary System Around HD 155358: The Lowest Metallicity Planet Host Star
• The non-LTE line formation of neutral carbon in late-type stars

Cited by in corpus (5)

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• A Sequoia stellar candidate with very high 7Li and 9Be