Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..623d&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The structure of the outer atmospheres of luminous cool stars reveals the evolution of magnetic activity as dynamo heating decreases and atmospheres expand while the stars evolve across the color-magnitude diagram. The relationship between winds and high temperature material can also be investigated. A comprehensive picture of the dynamics of the outer atmospheres is constructed based principally upon recent spectroscopic evidence from FUSE HST and optical and infrared spectra. In contrast to the solar example winds from cool giant and supergiant stars can exhibit supersonic acceleration in their chromospheres carry away more material and possess temperatures ranging from 10000K to 80000K. Coronal material near 107 K appears confined and does not participate in atmospheric expansion. Empirical relations between atmospheric structure and mass loss will be discussed. For metal deficient stars the discovery of signatures of pulsation may play an important role in driving mass loss. The detection of warm winds in cool giants and supergiants provides the crucial link between the hot fast solar wind with low mass loss and cool slow supergiant winds with substantially larger rates of mass loss.
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