Chemical Abundance Analysis of the Extremely Metal‐poor Star HE 1300+0157

  • Frebel A
  • Norris J
  • Aoki W
  • et al.
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Abstract

We present a detailed chemical abundance analysis of HE 1300+0157, a subgiant with [Fe/H]=-3.9. From a high-resolution, high-S/N Subaru HDS spectrum we find the star to be enriched in C ([C/Fe]1D~+1.4) and O ([O/Fe]1D~+1.8). With the exception of these species, HE 1300+0157 exhibits an elemental abundance pattern similar to that found in many other very and extremely metal-poor stars. The Li abundance is lower than the Spite plateau value, in agreement with expectation for its evolutionary status. Of particular interest, no neutron-capture elements are detected in HE 1300+0157. This type of abundance pattern has been found by recent studies in several other metal-poor giants. We suggest that HE 1300+0157 is an unevolved example of this group of stars, which exhibit high C abundances together with low (or absent) abundances of neutron-capture elements (CEMP-no). Several potential enrichment scenarios are presented. The nondetection of neutron-capture elements including Sr, Ba, and Pb suggests that the carbon excess observed in HE 1300+0157 is not due to mass transfer across a binary system. Such a scenario is applied to carbon-rich objects with excesses of s-process elements. The normal observed Li abundance supports this interpretation. Most likely, the high levels of C and O were produced prior to the birth of this star. It remains unclear whether a single faint SN is responsible for its overall chemical pattern, or whether one requires a superposition of yields from a massive Population III object and a hypernova. These scenarios provide important information on the C production in the early universe and on the formation of C-rich stars in the early Galaxy. Based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.

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Frebel, A., Norris, J. E., Aoki, W., Honda, S., Bessell, M. S., Takada‐Hidai, M., … Christlieb, N. (2007). Chemical Abundance Analysis of the Extremely Metal‐poor Star HE 1300+0157. The Astrophysical Journal, 658(1), 534–552. https://doi.org/10.1086/511517

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