Emission lines in the spectrum of VEGA

Details Emission lines in the spectrum of VEGA Emission lines in the spectrum of VEGA

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..139j&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, Apr.-May 1978, p. 139-143.

Astronomy and Astrophysics

Astronomy

13

Emission Spectra, Infrared Astronomy, Stellar Atmospheres, Stellar Spectra, Astronomical Models, Binary Stars, Calcium, Cygnus Constellation, Dwarf Stars, Lyra Constellation, Paschen Series, Spectral Resolution

Scientific paper

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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