The ultraviolet spectrum of Alpha Cygni

Details The ultraviolet spectrum of Alpha Cygni The ultraviolet spectrum of Alpha Cygni

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26as...32...69b&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 32, Apr. 1978, p. 69-81.

Astronomy and Astrophysics

Astrophysics

7

Astronomical Spectroscopy, Stellar Spectra, Ultraviolet Spectroscopy, Absorption Spectra, Abundance, Astronomical Catalogs, Line Spectra, Stellar Envelopes, Wavelengths

Scientific paper

Absorption features in the ultraviolet spectrum of Alpha Cyg were identified on the basis of Copernicus 0.4 A resolution tracings in the region 1800-2550 A. A comparison between observations and synthetic spectra (L.T.E. approximation) leads to T(eff) approximately 8500 K, log g equals 2.5. The line identifications indicate Al II, Al III, Si II, Si III, Ca II, Cr II, Mn II, Fe II, Fe III, Co II, Ni II, Cu II and Zn II are either definitely or probably present. C I, N II, Si I and S II are possibly present. Of the 568 absorption features listed in table 1, secure identifications have not been found for 67. Ionized iron atoms in an expanding shell may provide the principal contribution to four percent of the observed features.

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