Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982japa....3...39m&link_type=abstract
Journal of Astrophysics and Astronomy, vol. 3, Mar. 1982, p. 39-61. Research supported by the National Council of Educational R
Astronomy and Astrophysics
Astrophysics
15
G Stars, H Alpha Line, K Stars, Late Stars, Stellar Mass Ejection, Stellar Spectra, Supergiant Stars, Chromosphere, Mass Flow Rate, Spectrograms, Stellar Winds
Scientific paper
H-alpha is investigated spectroscopically in order to gain information on the properties of expanding chromospheres of late G and K supergiants. Spectra of 23 stars brighter than V equals 6.0 are obtained at dispersions of 4-10 A/mm using the coude and the coude-echelle spectrographs at the 102-cm telescope of Kavalur Observatory. H-alpha profiles are computed theoretically using radiative transfer in spherically symmetric expanding atmospheres covering a large range of integrated optical depths. These are then compared with the characteristics of the observed line in the program stars. The analysis reveals that the H-alpha line is formed in a region with velocity increasing outward. The computer equivalent widths and line core displacements are matched with those observed to obtain hydrogen column densities and expansion velocities.
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