Galactic twins of the nebula around SN 1987A: Hints that LBVs may be supernova progenitors

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

1 Scopus citations

Abstract

I discuss outstanding questions about the formation of the ring nebula around SN1987A and some implications of similar ring nebulae around Galactic B supergiants. There are notable obstacles for the formation of SN1987A's bipolar nebula through interacting winds in a transition from a red supergiant to a blue supergiant. Instead, several clues hint that the nebula may have been ejected in an LBV-like event. In addition to the previously known example of Sher 25, there are two newly-discovered Galactic analogs of SN1987A's ringed nebula. Of these three Galactic analogs around blue supergiants, two (Sher 25 and SBW1) have chemical abundances indicating that they have not been through a red supergiant phase, and the remaining ringed bipolar nebula surrounds a luminous blue variable (HD168625). Although SK - 69 202's initial mass of ∼20M is lower than those atributed to most LBVs, it is not far off and the low-luminosity end of the LBV phenomenon is not well defined. Furthermore, HD168625's luminosity indicates an initial mass of only ∼25M , that of SBW1 is consistent with ∼20M , and there is a B[e] star in the SMC with an initial mass of ∼20M that experienced an LBV outburst in the 1990s. These similarities may be giving us important clues about Sk - 69 202's pre-SN evolution and the formation mechanism of its nebula.

Original languageEnglish (US)
Title of host publicationSUPERNOVA 1987A
Subtitle of host publication20 YEARS AFTER: Supernovae and Gamma-Ray Bursters
Pages163-170
Number of pages8
DOIs
StatePublished - Dec 14 2007
Externally publishedYes
EventSUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters - Aspen, CO, United States
Duration: Feb 19 2007Feb 23 2007

Publication series

NameAIP Conference Proceedings
Volume937
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherSUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters
CountryUnited States
CityAspen, CO
Period2/19/072/23/07

Keywords

  • SN 1987A
  • Supernovae

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Smith, N. (2007). Galactic twins of the nebula around SN 1987A: Hints that LBVs may be supernova progenitors. In SUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters (pp. 163-170). (AIP Conference Proceedings; Vol. 937). https://doi.org/10.1063/1.2803557