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Mass loss in HR 1040 /A0 Ia/ - Analysis of Mg II lambda 2802 and H-alphaIt 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.
Document ID
19830045163
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kunasz, P. B.
Morrison, N. D.
Spressart, B.
Date Acquired
August 11, 2013
Publication Date
March 15, 1983
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
83A26381
Funding Number(s)
CONTRACT_GRANT: NSF AST-78-27620
CONTRACT_GRANT: NSG-5359
Distribution Limits
Public
Copyright
Other

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