BINARY SYSTEMS of CORE-COLLAPSE SUPERNOVAE POLLUTING A GIANT COMPANION

Efrat Sabach, Noam Soker

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We examine binary systems where when the more massive star, the primary, explodes as a core-collapse supernova (SN), the secondary star is already a giant that intercepts a large fraction of the ejecta. The ejecta might pollute the secondary star with newly synthesized elements such as calcium. We use Modules for Experiments in Stellar Astrophysics to calculate the evolution of such SN-polluted giant (SNPG) binaries. We estimate that on average at any given time tens of SNPGs are present in the Galaxy, and ≈ 10 SNPG objects are present in the Magellanic Clouds. We speculate that the high calcium abundance of the recently discovered evolved star HV 2112 in the Small Magellanic Cloud might be the result of an SNPG with a super-AGB stellar secondary of mass ≈ 9 M⊙. This rare SNPG scenario is an alternative explanation to HV 2112 being a Thorneżytkow object .

Original languageEnglish
Article number73
JournalAstrophysical Journal
Volume806
Issue number1
DOIs
StatePublished - 10 Jun 2015
Externally publishedYes

Keywords

  • binaries: close
  • stars: AGB and post-AGB
  • stars: evolution
  • stars: individual (HV 2112)
  • stars: massive
  • stars: peculiar

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