Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984comap..10...97h&link_type=abstract
Comments on Modern Physics, Part C - Comments on Astrophysics (ISSN 0146-2970), vol. 10, June 1984, p. 97-103.
Astronomy and Astrophysics
Astrophysics
1
Interstellar Gas, Molecular Clouds, Pre-Main Sequence Stars, Stellar Evolution, Stellar Winds, T Tauri Stars, H Alpha Line, Herbig-Haro Objects, Magnetohydrodynamic Waves, Radiant Flux Density, Star Formation Rate
Scientific paper
The present investigation is concerned with mass loss processes of low-luminosity stars. It is pointed out that, as a consequence of the large number of T Tauri stars present in molecular clouds, the mass ejected by such objects may well dominate the dynamics of the surrounding gas, and regulate star formation rates. Very high levels of chromospheric and coronal emission are found in T Tauri stars. The suggestion has been made that T Tauri emission might be the result of solar-type activity on a very large scale. But De Campli (1981) has shown that, unlike the solar wind, T Tauri winds cannot be thermally driven. He found that Alfven wave pressure was the most likely mechanism for driving T Tauri winds. Attention is also given to HH objects and CO flows, and the possibility that large quantities of material are ejected in FU Orionis-type events.
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