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Title: A study of the H-alpha line in late G and K supergiants
Authors: Mallik, S. G. V
Keywords: G Stars;H Alpha Line;K Stars;Late-Types Stars;Stellar Mass Ejection;Stellar Spectra;Supergiant Stars;Chromosphere;Spectrograms;Stellar Winds;Mass Loss
Issue Date: Mar-1982
Publisher: Indian Academy of Sciences
Citation: Journal of Astrophysics and Astronomy, Vol. 3, pp. 39 - 61
Abstract: 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.
Description: Open Access
ISSN: 0250-6335
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Appears in Collections:IIAP Publications

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