Nucleosynthesis in a Primordial Supernova: Carbon and Oxygen Abundances in SMSS J031300.36-670839.3
2015 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, Vol. 806, no 1, L16Article in journal (Refereed) Published
SMSS J031300.36-670839.3 (hereafter SM0313-6708) is a sub-giant halo star, with no detectable Fe lines and large overabundances of C and Mg relative to Ca. We obtained Very Large Telescope-Ultraviolet and Visual Echelle Spectrograph (UVES) spectra extending to 3060 angstrom showing strong OH A-X band lines enabling an oxygen abundance to be derived. The OH A-X band lines in SM0313-6708 are much stronger than the CH C-X band lines. Spectrum synthesis fits indicate an [O/C] ratio of 0.02 +/- 0.175. Our high signal-to-noise ratio UVES data also enabled us to lower the Fe abundance limit to [Fe/H](< 3D >,NLTE) < -7.52 (3 sigma). These data support our previous suggestion that the star formed from the iron-poor ejecta of a single massive star Population III supernova.
Place, publisher, year, edition, pages
2015. Vol. 806, no 1, L16
stars: Population III, supernovae: general, supernovae: individual (SMSS J031300.36)
IdentifiersURN: urn:nbn:se:uu:diva-258344DOI: 10.1088/2041-8205/806/1/L16ISI: 000356633700016OAI: oai:DiVA.org:uu-258344DiVA: diva2:841515