Faint emission features in the MG II resonance-line wings

Details Faint emission features in the MG II resonance-line wings Faint emission features in the MG II resonance-line wings

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218l.137a&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 218, Dec. 15, 1977, p. L137-L139.

Astronomy and Astrophysics

Astrophysics

1

Atomic Spectra, Emission Spectra, Fraunhofer Lines, Magnesium, Solar Spectra, Metal Ions, Spectral Resolution, Spectrographs, Stellar Spectra, Sun

Scientific paper

Data obtained with a rocket-borne echelle spectrograph are presented which indicate the presence of three faint emission features deep in the cores of the Mg II h and k resonance-line wings in the solar Fraunhofer spectrum. Results of wavelength measurements are discussed, and the relative intensities of the emission features are examined. It is tentatively suggested that the first feature be identified with the Fe II line at 2797.037 A, the second feature is probably the V II line at 2803.469 A, and the third feature may originate in Fe II emission at 2804.021 A. Possible emission mechanisms are proposed, and it is concluded that the detected features may be of potential diagnostic value for the analysis of depth variations of temperature and velocity in the lower chromosphere as well as for solar and possibly stellar spectroscopy.

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