The theoretical calculation of the rossby number and the "nonlocal" convective overturn time for pre-main-sequence and early post-main-sequence stars

Yong Cheol Kim, Pierre Demarque

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

This paper provides estimates of convective turnover timescales for Sun-like stars in the pre-main-sequence and early post-main-sequence phases of evolution, based on up-to-date physical input for the stellar models. In this first study, all models have solar abundances, which is typical of the stars in the Galactic disk, where most of the available data have been collected. A new feature of these models is the inclusion of rotation in the evolutionary sequences, thus making it possible to derive theoretically the Rossby number for each star along its evolutionary track, based on its calculated rotation rate and its local convective turnover time near the base of the convection zone. Global turnover times are also calculated for the complete convection zone. This information should make possible a new class of observational tests of stellar theory that were previously impossible with semiempirical models, particularly in the study of stellar activity and in research related to angular momentum transfer in stellar interiors during the course of stellar evolution.

Original languageEnglish
Pages (from-to)340-347
Number of pages8
JournalAstrophysical Journal
Volume457
Issue number1 PART I
Publication statusPublished - 1996 Jan 1

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Rossby number
overturn
main sequence stars
stars
turnover
convection
stellar interiors
stellar activity
stellar models
stellar evolution
momentum transfer
sun
angular momentum
inclusions
estimates
timescale
calculation

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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The theoretical calculation of the rossby number and the "nonlocal" convective overturn time for pre-main-sequence and early post-main-sequence stars. / Kim, Yong Cheol; Demarque, Pierre.

In: Astrophysical Journal, Vol. 457, No. 1 PART I, 01.01.1996, p. 340-347.

Research output: Contribution to journalArticle

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