Three-dimensional modelling of proton ingestion episodes in low-mass stars

Stuart A. Heap, Richard J. Stancliffe, John C. Lattanzio, David S P Dearborn

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

Abstract

We have modelled a dual shell flash (DSF) in a low-metallicity 1.5M AGB star using the 3-dimensional hydrodynamic program "Djehuty", observing how the evolution of these events compares to 1-dimensional models, which are hypothesised to be inaccurate due to the simplifications in the treatment of convective processes. In particular, the stability of the separated convective structure following hydrogen ignition is investigated. In both models constructed, the split convective zone structure was found to be unstable, with the velocities within the inner convective zone increasing until material breaks through the gap and recombines the two regions into a large single convective region.

Original languageEnglish
Title of host publicationFirst Stars IV - From Hayashi to the Future
Pages367-369
Number of pages3
Volume1480
DOIs
Publication statusPublished - 2012
EventConference on FIRST STARS - From Hayashi to the Future 2012 - Kyoto, Japan
Duration: 21 May 201225 May 2012
Conference number: 4th

Conference

ConferenceConference on FIRST STARS - From Hayashi to the Future 2012
CountryJapan
CityKyoto
Period21/05/1225/05/12

Keywords

  • Hydrodynamics
  • Intermediate-Mass
  • Low-Mass
  • Population II
  • Population III
  • Proton Ingestion
  • Stellar Evolution

Cite this

Heap, S. A., Stancliffe, R. J., Lattanzio, J. C., & Dearborn, D. S. P. (2012). Three-dimensional modelling of proton ingestion episodes in low-mass stars. In First Stars IV - From Hayashi to the Future (Vol. 1480, pp. 367-369) https://doi.org/10.1063/1.4754389
Heap, Stuart A. ; Stancliffe, Richard J. ; Lattanzio, John C. ; Dearborn, David S P. / Three-dimensional modelling of proton ingestion episodes in low-mass stars. First Stars IV - From Hayashi to the Future. Vol. 1480 2012. pp. 367-369
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Heap, SA, Stancliffe, RJ, Lattanzio, JC & Dearborn, DSP 2012, Three-dimensional modelling of proton ingestion episodes in low-mass stars. in First Stars IV - From Hayashi to the Future. vol. 1480, pp. 367-369, Conference on FIRST STARS - From Hayashi to the Future 2012, Kyoto, Japan, 21/05/12. https://doi.org/10.1063/1.4754389

Three-dimensional modelling of proton ingestion episodes in low-mass stars. / Heap, Stuart A.; Stancliffe, Richard J.; Lattanzio, John C.; Dearborn, David S P.

First Stars IV - From Hayashi to the Future. Vol. 1480 2012. p. 367-369.

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

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AU - Stancliffe, Richard J.

AU - Lattanzio, John C.

AU - Dearborn, David S P

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N2 - We have modelled a dual shell flash (DSF) in a low-metallicity 1.5M ⊙ AGB star using the 3-dimensional hydrodynamic program "Djehuty", observing how the evolution of these events compares to 1-dimensional models, which are hypothesised to be inaccurate due to the simplifications in the treatment of convective processes. In particular, the stability of the separated convective structure following hydrogen ignition is investigated. In both models constructed, the split convective zone structure was found to be unstable, with the velocities within the inner convective zone increasing until material breaks through the gap and recombines the two regions into a large single convective region.

AB - We have modelled a dual shell flash (DSF) in a low-metallicity 1.5M ⊙ AGB star using the 3-dimensional hydrodynamic program "Djehuty", observing how the evolution of these events compares to 1-dimensional models, which are hypothesised to be inaccurate due to the simplifications in the treatment of convective processes. In particular, the stability of the separated convective structure following hydrogen ignition is investigated. In both models constructed, the split convective zone structure was found to be unstable, with the velocities within the inner convective zone increasing until material breaks through the gap and recombines the two regions into a large single convective region.

KW - Hydrodynamics

KW - Intermediate-Mass

KW - Low-Mass

KW - Population II

KW - Population III

KW - Proton Ingestion

KW - Stellar Evolution

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BT - First Stars IV - From Hayashi to the Future

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Heap SA, Stancliffe RJ, Lattanzio JC, Dearborn DSP. Three-dimensional modelling of proton ingestion episodes in low-mass stars. In First Stars IV - From Hayashi to the Future. Vol. 1480. 2012. p. 367-369 https://doi.org/10.1063/1.4754389