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Title:
The behavior of the MG II doublet features near 2800 A observed in F, A, and B supergiants
Authors:
Kondo, Y.; Morgan, T. H.; Modisette, J. L.
Affiliation:
AA(NASA, Johnson Space Cente; Houston, University, Houston, Tex; Oklahoma, University, Norman, Okla.), AB(Houston Baptist University, Houston, Tex.), AC(Houston Baptist University, Houston, Tex.)
Publication:
Astrophysical Journal, vol. 209, Oct. 15, 1976, pt. 1, p. 489-496. (ApJ Homepage)
Publication Date:
10/1976
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
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
DOI:
10.1086/154742
Bibliographic Code:
1976ApJ...209..489K

Abstract

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.

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