Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209..489k&link_type=abstract
Astrophysical Journal, vol. 209, Oct. 15, 1976, pt. 1, p. 489-496.
Astronomy and Astrophysics
Astrophysics
24
Emission Spectra, F Stars, Fine Structure, Line Spectra, Magnesium, Stellar Mass Ejection, Supergiant Stars, Balloon-Borne Instruments, Main Sequence Stars, Photon Density, Stellar Spectra, Ultraviolet Spectra
Scientific paper
The Mg II doublet features near 2800 A were recently observed in F-, A-, and B-type supergiants with a balloon-borne ultraviolet stellar spectrometer. The stars observed are Alpha UMi (F8 Ib), Alpha Per (F5 Ib), Eta Leo (A0 Ib), and Rho Leo (B1 Ib). The Mg II doublet features in Alpha UMi and Alpha Per show emission superposed on photospheric absorption. In the spectrum of Eta Leo, the Mg II lines are in absorption and show shortward-shifted components attributable to mass loss. In the spectrum of Rho Leo, the Mg II lines are primarily a composite of the photospheric and interstellar absorption features. The general behavior of the Mg II lines for supergiants of spectral types M through B are also discussed.
Kondo Yoshihiko
Modisette Jerry L.
Morgan Thomas H.
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