Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349...81i&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 81-92 (SEE N85-20961 11-
Astronomy and Astrophysics
Astronomy
1
Herbig-Haro Objects, Iue, O Stars, Stellar Evolution, Stellar Mass, T Tauri Stars, Ultraviolet Astronomy, Emission Spectra, Far Ultraviolet Radiation, Interstellar Matter, Magnesium, Magnetic Fields, Stellar Flares, Stellar Winds
Scientific paper
The T Tauri stars represent an invaluable probe of the physical mechanisms involved in star formation and the genesis of stellar magnetic fields and surface activity. Ultraviolet studies of the T Tauri and related stars were concentrated in four areas. First, the very strong Mg II emission lines were observed in order to determine fluxes, line profiles, and variability. Most evidence points to the formation of these strong lines in an extended atmosphere and/or wind. Second, the far-ultraviolet emission lines were observed to provide diagnostics of the hotter atmospheric regions. The behavior of these lines is very similar to that of the most active late-type stars, lending credence to the belief that many of the T Tauri characteristics are the result of high levels of surface activity. Third, the ultraviolet continuum, which originates largely in the chromosphere, shows potential as a chromospheric diagnostic. Finally, observations of related objects may be used to gain insight into the evolutionary changes occurring during pre-main sequences evolution.
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