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

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

doi:10.1063/1.4754389

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 proceeding › Conference Paper › Other

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 language	English
Title of host publication	First Stars IV - From Hayashi to the Future
Pages	367-369
Number of pages	3
Volume	1480
DOIs	https://doi.org/10.1063/1.4754389
Publication status	Published - 2012
Event	Conference on FIRST STARS - From Hayashi to the Future 2012 - Kyoto, Japan Duration: 21 May 2012 → 25 May 2012 Conference number: 4th

Conference

Conference	Conference on FIRST STARS - From Hayashi to the Future 2012
Country/Territory	Japan
City	Kyoto
Period	21/05/12 → 25/05/12

Keywords

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

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10.1063/1.4754389

Cite this

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title = "Three-dimensional modelling of proton ingestion episodes in low-mass stars",

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.",

keywords = "Hydrodynamics, Intermediate-Mass, Low-Mass, Population II, Population III, Proton Ingestion, Stellar Evolution",

author = "Heap, {Stuart A.} and Stancliffe, {Richard J.} and Lattanzio, {John C.} and Dearborn, {David S P}",

year = "2012",

doi = "10.1063/1.4754389",

language = "English",

isbn = "9780735410923",

volume = "1480",

pages = "367--369",

booktitle = "First Stars IV - From Hayashi to the Future",

note = "Conference on FIRST STARS - From Hayashi to the Future 2012 ; Conference date: 21-05-2012 Through 25-05-2012",

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TY - GEN

T1 - Three-dimensional modelling of proton ingestion episodes in low-mass stars

AU - Heap, Stuart A.

AU - Stancliffe, Richard J.

AU - Lattanzio, John C.

AU - Dearborn, David S P

N1 - Conference code: 4th

PY - 2012

Y1 - 2012

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

UR - http://www.scopus.com/inward/record.url?scp=84875501029&partnerID=8YFLogxK

U2 - 10.1063/1.4754389

DO - 10.1063/1.4754389

M3 - Conference Paper

AN - SCOPUS:84875501029

SN - 9780735410923

VL - 1480

SP - 367

EP - 369

BT - First Stars IV - From Hayashi to the Future

T2 - Conference on FIRST STARS - From Hayashi to the Future 2012

Y2 - 21 May 2012 through 25 May 2012

ER -

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

Abstract

Conference

Keywords

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Three-Dimensional Modelling of Proton Ingestion Episodes in Low-Mass Stars

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