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Emission lines in the spectrum of VEGA
Publications of the Astronomical Society of the Pacific1978Vol. 90, pp. 139–139
Citations Over TimeTop 15% of 1978 papers
Abstract
The infrared lines of Ca II and O I in the spectrum of Vega are found to have small violet-shifted emission satellites. It is therefore suggested that Vega has a relatively thin, extended atmosphere, which may be expanding. The measured equivalent widths of the emission satellites range from 0.02 A to 0.07 A, averaging about 0.05 A. It is the very high photometric precision of the spectra produced by an advanced Michelson spectrophotometer system which makes possible the detection and measurement of such minute details.
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