GRB nucleosynthesis in dwarf galaxies

T. Shigeyama, K. Nakamura, T. Tsujimoto, T. Moriya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Recent observations with large telescopes have revealed that stars in nearby dwarf spheroidal galaxies (dSph stars) have elemental abundances distinct from metal poor stars in our galaxy [7, 8, 9]. This indicates that the chemical evolution of these dwarf galaxies was dominated by supernovae that have not mainly contributed to the chemical evolution of our galaxy. On the other hand, the identification of host galaxies of gamma-ray bursts (GRBs) suggests that GRBs may preferentially occur in low luminosity metal-poor galaxies [6]. Supernovae associated with GRBs might have exclusively imprinted their nucleosynthesis on the elemental abundances of stars in dwarf galaxies while these supernovae were too rare to contribute to the chemical evolution of our galaxy. To test this conjecture, we have planned to perform nucleosynthesis calculations in aspherical supernovae and investigate the elemental abundance patterns of stars inheriting the nucleosynthesis products by taking into account ejecta with different abundance patterns moving in different directions. As a consequence, we found that aspherical supernovae could be responsible for low α/Fe ratios (except for Ca/Fe) and/or large scatter of the abundance ratios seen in dSph stars. The abundance ratios of O/Mg are found to be a good indicator to identify the progenitor stars that have supplied heavy elements to dSph stars.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
Pages415-417
Number of pages3
Volume1279
DOIs
Publication statusPublished - 2010
Externally publishedYes
EventInternational Symposium "Deciphering the Ancient Universe with Gamma-Ray Bursts" - Kyoto
Duration: 2010 Apr 192010 Apr 23

Other

OtherInternational Symposium "Deciphering the Ancient Universe with Gamma-Ray Bursts"
CityKyoto
Period10/4/1910/4/23

Keywords

  • Abundance
  • Dwarf spheroidal galaxies
  • Nucleosynthesis
  • Supernovae

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Shigeyama, T., Nakamura, K., Tsujimoto, T., & Moriya, T. (2010). GRB nucleosynthesis in dwarf galaxies. In AIP Conference Proceedings (Vol. 1279, pp. 415-417) https://doi.org/10.1063/1.3509331