The run of superadiabaticity in stellar convection zones. I. The sun

P. Demarque, D. B. Guenther, Y. C. Kim

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The effect of adjustments to the superadiabatic layer (SAL) in a model of the Sun on the p-mode oscillation frequencies has been studied. Numerical simulations of solar convection by Kim and coworkers have shown that the usual mixing length approximation (MLA) overestimates the convective efficiency in the SAL. To correct for the overestimated convective efficiency in the calculation of the temperature gradient and the mean structure of the SAL, we have adopted a variable mixing length parameter, which decreases as the surface is approached, based on a simple parameterization suggested by the simulations. We find that these changes to the structure of the SAL reduce the discrepancies between observed and calculated oscillation frequencies in the low to intermediate l range.

Original languageEnglish
Pages (from-to)790-797
Number of pages8
JournalAstrophysical Journal
Volume474
Issue number2 PART I
DOIs
Publication statusPublished - 1997 Jan 1

Fingerprint

stellar convection
sun
convection
oscillation
oscillations
parameterization
temperature gradient
simulation
temperature gradients
adjusting
approximation

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Demarque, P. ; Guenther, D. B. ; Kim, Y. C. / The run of superadiabaticity in stellar convection zones. I. The sun. In: Astrophysical Journal. 1997 ; Vol. 474, No. 2 PART I. pp. 790-797.
@article{370cb847d04743e7a610e26f280f04a5,
title = "The run of superadiabaticity in stellar convection zones. I. The sun",
abstract = "The effect of adjustments to the superadiabatic layer (SAL) in a model of the Sun on the p-mode oscillation frequencies has been studied. Numerical simulations of solar convection by Kim and coworkers have shown that the usual mixing length approximation (MLA) overestimates the convective efficiency in the SAL. To correct for the overestimated convective efficiency in the calculation of the temperature gradient and the mean structure of the SAL, we have adopted a variable mixing length parameter, which decreases as the surface is approached, based on a simple parameterization suggested by the simulations. We find that these changes to the structure of the SAL reduce the discrepancies between observed and calculated oscillation frequencies in the low to intermediate l range.",
author = "P. Demarque and Guenther, {D. B.} and Kim, {Y. C.}",
year = "1997",
month = "1",
day = "1",
doi = "10.1086/303477",
language = "English",
volume = "474",
pages = "790--797",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 PART I",

}

The run of superadiabaticity in stellar convection zones. I. The sun. / Demarque, P.; Guenther, D. B.; Kim, Y. C.

In: Astrophysical Journal, Vol. 474, No. 2 PART I, 01.01.1997, p. 790-797.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The run of superadiabaticity in stellar convection zones. I. The sun

AU - Demarque, P.

AU - Guenther, D. B.

AU - Kim, Y. C.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - The effect of adjustments to the superadiabatic layer (SAL) in a model of the Sun on the p-mode oscillation frequencies has been studied. Numerical simulations of solar convection by Kim and coworkers have shown that the usual mixing length approximation (MLA) overestimates the convective efficiency in the SAL. To correct for the overestimated convective efficiency in the calculation of the temperature gradient and the mean structure of the SAL, we have adopted a variable mixing length parameter, which decreases as the surface is approached, based on a simple parameterization suggested by the simulations. We find that these changes to the structure of the SAL reduce the discrepancies between observed and calculated oscillation frequencies in the low to intermediate l range.

AB - The effect of adjustments to the superadiabatic layer (SAL) in a model of the Sun on the p-mode oscillation frequencies has been studied. Numerical simulations of solar convection by Kim and coworkers have shown that the usual mixing length approximation (MLA) overestimates the convective efficiency in the SAL. To correct for the overestimated convective efficiency in the calculation of the temperature gradient and the mean structure of the SAL, we have adopted a variable mixing length parameter, which decreases as the surface is approached, based on a simple parameterization suggested by the simulations. We find that these changes to the structure of the SAL reduce the discrepancies between observed and calculated oscillation frequencies in the low to intermediate l range.

UR - http://www.scopus.com/inward/record.url?scp=21444436053&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=21444436053&partnerID=8YFLogxK

U2 - 10.1086/303477

DO - 10.1086/303477

M3 - Article

AN - SCOPUS:21444436053

VL - 474

SP - 790

EP - 797

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART I

ER -