The effect of the Mihalas, Hummer, and Dappen equation of state and the molecular opacity on the standard solar model

Yong Cheol Kim, P. Demarque, D. B. Guenther

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Improvements to the Yale Rotating Stellar Evolution Code by incorporating the Mihalas-Hummer-Däppen equation of state, an improved opacity interpolation routine, and the effects of molecular opacities, calculated at Los Alamos, have been made. The effect of each of the improvements on the standard solar model has been tested independently by computing the corresponding solar nonradial oscillation frequencies. According to these tests, the Mihalas-Hummer-Däppen equation of state has very little effect on the model's low l p-mode oscillation spectrum compared to the model using the existing analytical equation of state implemented in YREC. On the other hand, the molecular opacity does improve the model's oscillation spectrum. The effect of molecular opacity on the computed solar oscillation frequencies is much larger than that of the Mihalas-Hummer-Däppen equation of state. Together, the two improvements to the physics reduce the discrepancy with observations by 10 μHz for the low l modes.

Original languageEnglish
Pages (from-to)407-412
Number of pages6
JournalAstrophysical Journal
Volume378
Issue number1
Publication statusPublished - 1991 Sep 1

Fingerprint

opacity
equation of state
equations of state
oscillation
solar oscillations
oscillations
stellar evolution
interpolation
physics
effect

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

@article{988d5278f09649649d59b3e3eb409b72,
title = "The effect of the Mihalas, Hummer, and Dappen equation of state and the molecular opacity on the standard solar model",
abstract = "Improvements to the Yale Rotating Stellar Evolution Code by incorporating the Mihalas-Hummer-D{\"a}ppen equation of state, an improved opacity interpolation routine, and the effects of molecular opacities, calculated at Los Alamos, have been made. The effect of each of the improvements on the standard solar model has been tested independently by computing the corresponding solar nonradial oscillation frequencies. According to these tests, the Mihalas-Hummer-D{\"a}ppen equation of state has very little effect on the model's low l p-mode oscillation spectrum compared to the model using the existing analytical equation of state implemented in YREC. On the other hand, the molecular opacity does improve the model's oscillation spectrum. The effect of molecular opacity on the computed solar oscillation frequencies is much larger than that of the Mihalas-Hummer-D{\"a}ppen equation of state. Together, the two improvements to the physics reduce the discrepancy with observations by 10 μHz for the low l modes.",
author = "Kim, {Yong Cheol} and P. Demarque and Guenther, {D. B.}",
year = "1991",
month = "9",
day = "1",
language = "English",
volume = "378",
pages = "407--412",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

The effect of the Mihalas, Hummer, and Dappen equation of state and the molecular opacity on the standard solar model. / Kim, Yong Cheol; Demarque, P.; Guenther, D. B.

In: Astrophysical Journal, Vol. 378, No. 1, 01.09.1991, p. 407-412.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The effect of the Mihalas, Hummer, and Dappen equation of state and the molecular opacity on the standard solar model

AU - Kim, Yong Cheol

AU - Demarque, P.

AU - Guenther, D. B.

PY - 1991/9/1

Y1 - 1991/9/1

N2 - Improvements to the Yale Rotating Stellar Evolution Code by incorporating the Mihalas-Hummer-Däppen equation of state, an improved opacity interpolation routine, and the effects of molecular opacities, calculated at Los Alamos, have been made. The effect of each of the improvements on the standard solar model has been tested independently by computing the corresponding solar nonradial oscillation frequencies. According to these tests, the Mihalas-Hummer-Däppen equation of state has very little effect on the model's low l p-mode oscillation spectrum compared to the model using the existing analytical equation of state implemented in YREC. On the other hand, the molecular opacity does improve the model's oscillation spectrum. The effect of molecular opacity on the computed solar oscillation frequencies is much larger than that of the Mihalas-Hummer-Däppen equation of state. Together, the two improvements to the physics reduce the discrepancy with observations by 10 μHz for the low l modes.

AB - Improvements to the Yale Rotating Stellar Evolution Code by incorporating the Mihalas-Hummer-Däppen equation of state, an improved opacity interpolation routine, and the effects of molecular opacities, calculated at Los Alamos, have been made. The effect of each of the improvements on the standard solar model has been tested independently by computing the corresponding solar nonradial oscillation frequencies. According to these tests, the Mihalas-Hummer-Däppen equation of state has very little effect on the model's low l p-mode oscillation spectrum compared to the model using the existing analytical equation of state implemented in YREC. On the other hand, the molecular opacity does improve the model's oscillation spectrum. The effect of molecular opacity on the computed solar oscillation frequencies is much larger than that of the Mihalas-Hummer-Däppen equation of state. Together, the two improvements to the physics reduce the discrepancy with observations by 10 μHz for the low l modes.

UR - http://www.scopus.com/inward/record.url?scp=12044259449&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=12044259449&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:12044259449

VL - 378

SP - 407

EP - 412

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

ER -