Asteroseismic Constraints on the Models of Hot B Subdwarfs: Convective Helium-Burning Cores

Jan Torge Schindler, Elizabeth M. Green, W. David Arnett

Research output: Research - peer-reviewArticle

Abstract

Asteroseismology of non-radial pulsations in Hot B Subdwarfs (sdB stars) offers a unique view into the interior of core-helium-burning stars. Ground-based and space-borne high precision light curves allow for the analysis of pressure and gravity mode pulsations to probe the structure of sdB stars deep into the convective core. As such asteroseismological analysis provides an excellent opportunity to test our understanding of stellar evolution. In light of the newest constraints from asteroseismology of sdB and red clump stars, standard approaches of convective mixing in 1D stellar evolution models are called into question. The problem lies in the current treatment of overshooting and the entrainment at the convective boundary. Unfortunately no consistent algorithm of convective mixing exists to solve the problem, introducing uncertainties to the estimates of stellar ages. Three dimensional simulations of stellar convection show the natural development of an overshooting region and a boundary layer. In search for a consistent prescription of convection in one dimensional stellar evolution models, guidance from three dimensional simulations and asteroseismological results is indispensable.

LanguageEnglish (US)
Article number04001
JournalEPJ Web of Conferences
Volume160
DOIs
StatePublished - Oct 27 2017

Fingerprint

stellar evolution
helium
stars
asteroseismology
simulation
stellar convection
subdwarf stars
B stars
entrainment
clumps
light curve
boundary layers
convection
gravitation
probes
estimates

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Asteroseismic Constraints on the Models of Hot B Subdwarfs : Convective Helium-Burning Cores. / Schindler, Jan Torge; Green, Elizabeth M.; Arnett, W. David.

In: EPJ Web of Conferences, Vol. 160, 04001, 27.10.2017.

Research output: Research - peer-reviewArticle

@article{e2400d5bd85a4dcfa158d9c365b223c1,
title = "Asteroseismic Constraints on the Models of Hot B Subdwarfs: Convective Helium-Burning Cores",
abstract = "Asteroseismology of non-radial pulsations in Hot B Subdwarfs (sdB stars) offers a unique view into the interior of core-helium-burning stars. Ground-based and space-borne high precision light curves allow for the analysis of pressure and gravity mode pulsations to probe the structure of sdB stars deep into the convective core. As such asteroseismological analysis provides an excellent opportunity to test our understanding of stellar evolution. In light of the newest constraints from asteroseismology of sdB and red clump stars, standard approaches of convective mixing in 1D stellar evolution models are called into question. The problem lies in the current treatment of overshooting and the entrainment at the convective boundary. Unfortunately no consistent algorithm of convective mixing exists to solve the problem, introducing uncertainties to the estimates of stellar ages. Three dimensional simulations of stellar convection show the natural development of an overshooting region and a boundary layer. In search for a consistent prescription of convection in one dimensional stellar evolution models, guidance from three dimensional simulations and asteroseismological results is indispensable.",
author = "Schindler, {Jan Torge} and Green, {Elizabeth M.} and Arnett, {W. David}",
year = "2017",
month = "10",
doi = "10.1051/epjconf/201716004001",
volume = "160",
journal = "EPJ Web of Conferences",
issn = "2101-6275",
publisher = "EDP Sciences",

}

TY - JOUR

T1 - Asteroseismic Constraints on the Models of Hot B Subdwarfs

T2 - EPJ Web of Conferences

AU - Schindler,Jan Torge

AU - Green,Elizabeth M.

AU - Arnett,W. David

PY - 2017/10/27

Y1 - 2017/10/27

N2 - Asteroseismology of non-radial pulsations in Hot B Subdwarfs (sdB stars) offers a unique view into the interior of core-helium-burning stars. Ground-based and space-borne high precision light curves allow for the analysis of pressure and gravity mode pulsations to probe the structure of sdB stars deep into the convective core. As such asteroseismological analysis provides an excellent opportunity to test our understanding of stellar evolution. In light of the newest constraints from asteroseismology of sdB and red clump stars, standard approaches of convective mixing in 1D stellar evolution models are called into question. The problem lies in the current treatment of overshooting and the entrainment at the convective boundary. Unfortunately no consistent algorithm of convective mixing exists to solve the problem, introducing uncertainties to the estimates of stellar ages. Three dimensional simulations of stellar convection show the natural development of an overshooting region and a boundary layer. In search for a consistent prescription of convection in one dimensional stellar evolution models, guidance from three dimensional simulations and asteroseismological results is indispensable.

AB - Asteroseismology of non-radial pulsations in Hot B Subdwarfs (sdB stars) offers a unique view into the interior of core-helium-burning stars. Ground-based and space-borne high precision light curves allow for the analysis of pressure and gravity mode pulsations to probe the structure of sdB stars deep into the convective core. As such asteroseismological analysis provides an excellent opportunity to test our understanding of stellar evolution. In light of the newest constraints from asteroseismology of sdB and red clump stars, standard approaches of convective mixing in 1D stellar evolution models are called into question. The problem lies in the current treatment of overshooting and the entrainment at the convective boundary. Unfortunately no consistent algorithm of convective mixing exists to solve the problem, introducing uncertainties to the estimates of stellar ages. Three dimensional simulations of stellar convection show the natural development of an overshooting region and a boundary layer. In search for a consistent prescription of convection in one dimensional stellar evolution models, guidance from three dimensional simulations and asteroseismological results is indispensable.

UR - http://www.scopus.com/inward/record.url?scp=85033493156&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85033493156&partnerID=8YFLogxK

U2 - 10.1051/epjconf/201716004001

DO - 10.1051/epjconf/201716004001

M3 - Article

VL - 160

JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

SN - 2101-6275

M1 - 04001

ER -