Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..339g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 1, 1986, p. 339-347.
Astronomy and Astrophysics
Astrophysics
76
Chromosphere, Pre-Main Sequence Stars, Stellar Activity, Stellar Evolution, Stellar Rotation, T Tauri Stars, Angular Momentum, Convection, Dynamo Theory, Emission Spectra, Stellar Mass, Stellar Radiation
Scientific paper
Simon et al. (1985) have considered the hypothesis that the nonradiative flux levels of PMS stars can be explained as a direct extension of the work of Noyes et al. (1984), who showed that the Ca II H and K emission flux levels in main-sequence stars are well correlated with the Rossby number (Ro). Ro is identical with the ratio P-rot/tau-conv, where P-rot is the stellar rotation period and tau-conv is a characteristic turnover time scale for convection. Detailed evaluations of tau-conv on the PMS are reported and employed to test the hypothesis considered by Simon et al. that T Tauri nonradiative fluxes follow from having large tau-conv on the PMS. It is found that the evolution of tau-conv on the PMS is a strong function of stellar mass and age. Attention is given to stellar evolution results, chromospheric flux generation, and angular momentum considerations.
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