The evolution of chromospheric activity and the spin-down of solar-type stars

Details The evolution of chromospheric activity and the spin-down of solar-type stars The evolution of chromospheric activity and the spin-down of solar-type stars

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...293..551s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 293, June 15, 1985, p. 551-570; 573, 574.

Astronomy and Astrophysics

Astrophysics

161

Chromosphere, Stellar Activity, Stellar Evolution, T Tauri Stars, Chronology, Emission Spectra, Iue, Stellar Rotation, Ultraviolet Spectroscopy

Scientific paper

The authors report on observations made with the IUE satellite of nearly two dozen F7 - G2 dwarfs, dated on the basis of their surface Li content in order to examine the age dependence of ultraviolet chromospheric and transition region emission lines. The IUE data for solar-type stars are compared with observations of T Tauri stars (both published and newly reported here) in order to determine whether the pattern of main-sequence chromospheric decay shown by stars older than ≡108yr extends back to ages of 106yr appropriate for T Tauri stars. The analysis of the time decay of stellar ultraviolet and X-ray emission establishes a relationship between emission level and axial rotation, which is expressed in terms of the Rossby parameter (here taken to be the stellar rotation period divided by a characteristic turnover time for subphotospheric convection). It is suggested that the evolution of main- sequence activity reflects a diminishing coverage of stellar active regions with age.

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