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Paper: Hα Variations in the Spectrum of the Supergiant HD 199478
Volume: 510, Stars: From Collapse to Collapse
Page: 166
Authors: Ismailova, Sh. K.; Ismailov, N. Z.; Mikailov, Kh. M.
Abstract: We present the results of observations of profiles and spectral parameters of the Hα line in the spectrum of the supergiant HD 199478 in 2011 and 2013–2015. We discovered variations in the parameters of the line with a characteristic time of 22 days, which agrees well with the data of other authors. Variations are not strictly periodic in nature and possibly are the results of radial pulsations in upper layers of the stellar atmosphere.
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