Singly ionized iron as a diagnostic of stellar envelopes. I - The methods

Details Singly ionized iron as a diagnostic of stellar envelopes. I - The methods Singly ionized iron as a diagnostic of stellar envelopes. I - The methods

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...188..100f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 188, no. 1, Dec. 1987, p. 100-108.

Astronomy and Astrophysics

Astrophysics

30

Emission Spectra, Ionization Potentials, Iron, Line Spectra, Stellar Envelopes, Stellar Winds, Optical Thickness, Stellar Mass Ejection, Stellar Spectrophotometry

Scientific paper

A self-absorption curve (SAC) method is proposed for studying the emission line spectra of Fe II and for deriving physical and geometrical parameters such as the characteristic excitation temperature, size, and density of the line emitting region. SAC curves are defined from observational plots of a quantity related to the line flux emitted in a transition versus the optical thickness of that transition. Emission line SACs constructed from the optical region transitions and the absorption line curves of growth for both low and high velocity winds can be used to perform spectral syntheses for the interpretation of low resolution spectra in the crowded UV region.

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