Abstract
view Abstract Citations (74) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the relationship between coronae and mass loss in late-type stars. Hartmann, L. ; Dupree, A. K. ; Raymond, J. C. Abstract High-dispersion spectra taken with the IUE are used to examine the temperature stratification of the wind of the hybrid atmosphere star Alpha TrA (K4 II). C IV emission is shown to have a line width of 150-200 km/s, with Si III and C III exhibiting 100 km/s widths. It is suggested that the line widths reflect wind expansion, with C IV formed in an extended region flowing near the wind terminal velocity of 85 km/s. It is shown that the observed line widths can be accounted for by the stellar wind theory of Hartmann and MacGregor, in which the schematic dissipation of Alfven waves drives the outflow in addition to heating the wind. The observations of the warm expanding corona in Alpha TrA suggest a continuous progression between the high temperature low-mass-flux solar wind and the winds of luminous cool stars. Publication: The Astrophysical Journal Pub Date: May 1981 DOI: 10.1086/158911 Bibcode: 1981ApJ...246..193H Keywords: Late Stars; Stellar Atmospheres; Stellar Coronas; Stellar Mass Ejection; Stellar Spectra; Stellar Winds; Chromosphere; Cool Stars; Emission Spectra; Iue; Line Spectra; Magnetohydrodynamic Waves; Plasma Temperature; Spectral Line Width; Spectrum Analysis; Stellar Envelopes; Ultraviolet Spectra; Astrophysics full text sources ADS | data products SIMBAD (1) MAST (1)
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