Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..739k&link_type=abstract
Astrophysical Journal, Part 1, vol. 266, Mar. 15, 1983, p. 739-746.
Astronomy and Astrophysics
Astronomy
5
A Stars, Stellar Mass Ejection, Supergiant Stars, Ultraviolet Astronomy, Absorption Spectra, Atmospheric Models, H Alpha Line, Iue, Line Spectra, Magnesium, Radial Velocity, Resonance Lines, Stellar Atmospheres
Scientific paper
It is pointed out that International Ultraviolet Explorer (IUE) data for several early A type supergiants are now available to complement the ground-based spectroscopic data available for these bright stars. An examination of the resonance doublet of Mg II in the A type supergiants reveals that HR 1040 (HD 21389) is the only star in the observational literature in which a violet-shifted, deep absorption line is present without complete saturation. From an unsaturated profile, a good estimate of Mg(+) density can be found by means of accurate radiative transfer calculations. A relation can then be derived between mass loss rate and ionization balance. When certain velocity-related quantities can be estimated from a Mg II line profile, the H-alpha provides an estimate of the mass loss rate. The present investigation is concerned with an application of these diagnostics to HR 1040.
Kunasz Paul Belknap
Morrison Nancy D.
Spressart B.
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