Show simple item record

dc.contributorArmagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland;
dc.contributorArmagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland
dc.contributor.authorPetrov, Blagovest
dc.contributor.authorVink, Jorick S.
dc.contributor.authorGräfener, Götz
dc.date.accessioned2024-02-01T17:09:44Z
dc.date.available2024-02-01T17:09:44Z
dc.date.issued2016-05-01T00:00:00Z
dc.identifier.doi10.1093/mnras/stw382
dc.identifier.doi10.48550/arXiv.1602.05868
dc.identifier.other2016arXiv160205868P
dc.identifier.other2016MNRAS.tmp..168P
dc.identifier.otherastro-ph.SR
dc.identifier.other10.1093/mnras/stw382
dc.identifier.other2016MNRAS.tmp..168P
dc.identifier.otherarXiv:1602.05868
dc.identifier.other2016MNRAS.458.1999P
dc.identifier.other10.48550/arXiv.1602.05868
dc.identifier.other2016arXiv160205868P
dc.identifier.other-
dc.identifier.urihttp://hdl.handle.net/20.500.14302/1287
dc.description.abstractLuminous blue variables (LBVs) have been suggested to be the direct progenitors of supernova Types IIb and IIn, with enhanced mass loss prior to explosion. However, the mechanism of this mass loss is not yet known. Here, we investigate the qualitative behaviour of theoretical stellar wind mass loss as a function of T<SUB>eff</SUB> across two bi-stability jumps in blue supergiant regime and also in proximity to the Eddington limit, relevant for LBVs. To investigate the physical ingredients that play a role in the radiative acceleration we calculate blue supergiant wind models with the CMFGEN non-local thermodynamic equilibrium model atmosphere code over an effective temperature range between 30 000 and 8800 K. Although our aim is not to provide new mass-loss rates for BA supergiants, we study and confirm the existence of two bi-stability jumps in mass-loss rates predicted by Vink et al. However, they are found to occur at somewhat lower T<SUB>eff</SUB> (20 000 and 9000 K, respectively) than found previously, which would imply that stars may evolve towards lower T<SUB>eff</SUB> before strong mass loss is induced by the bi-stability jumps. When the combined effects of the second bi-stability jump and the proximity to Eddington limit are accounted for, we find a dramatic increase in the mass-loss rate by up to a factor of 30. Further investigation of both bi-stability jumps is expected to lead to a better understanding of discrepancies between empirical modelling and theoretical mass-loss rates reported in the literature, and to provide key inputs for the evolution of both normal AB supergiants and LBVs, as well as their subsequent supernova Type II explosions.
dc.publisherMonthly Notices of the Royal Astronomical Society
dc.titleTwo bi-stability jumps in theoretical wind models for massive stars and the implications for luminous blue variable supernovae
dc.typearticle
dc.source.journalMNRAS
dc.source.journalMNRAS.458
dc.source.volume458
refterms.dateFOA2024-02-01T17:09:44Z
dc.identifier.bibcode2016MNRAS.458.1999P


Files in this item

Thumbnail
Name:
2016MNRAS.458.1999P.pdf
Size:
2.100Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record