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Nucleosynthesis in a Primordial Supernova: Carbon and Oxygen Abundances in SMSS J031300.36-670839.3

Abstract : 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 Å 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 (3σ). These data support our previous suggestion that the star formed from the iron-poor ejecta of a single massive star Population III supernova.

Based on observations obtained with European Southern Observatory (ESO) telescopes (proposal 092.D-0742).

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Submitted on : Tuesday, April 19, 2022 - 2:46:17 PM
Last modification on : Wednesday, April 20, 2022 - 3:40:09 AM

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Michael S. Bessell, Remo Collet, Stefan C. Keller, Anna Frebel, Alexander Heger, et al.. Nucleosynthesis in a Primordial Supernova: Carbon and Oxygen Abundances in SMSS J031300.36-670839.3. The Astrophysical Journal Letters, 2015, 806, ⟨10.1088/2041-8205/806/1/L16⟩. ⟨insu-03644935⟩

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