T Tauri stars: Not one but two transition regions

Details T Tauri stars: Not one but two transition regions T Tauri stars: Not one but two transition regions

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176...89b&link_type=abstract

In ESA 3rd European IUE Conf. p 89-94 (SEE N83-11889 02-88)

Astronomy and Astrophysics

Astronomy

4

Boundary Layer Transition, Stellar Envelopes, Stellar Temperature, T Tauri Stars, Stellar Coronas, Stellar Mass Ejection, Stellar Radiation, Temperature Gradients, Ultraviolet Spectra, X Ray Astronomy

Scientific paper

It is shown that IUE and X-ray observations of T Tauri stars can be explained by a model which takes the cooling and condensing of a moderately dense corona into account. This model includes two transition regions between coronal gas and cool gas: the usual zone between chromosphere and corona, and the region between corona and cool circumstellar gas. The variations with temperature of the transition region emission measures, as deduced from IUE observations of a few T Tauri stars, are compared to those of the computed models. Agreement is found for mass loss rates much lower than usually assumed for T Tauri stars.

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