Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.291n&link_type=abstract
In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 291-293 (SEE N89-10682 01-89)
Astronomy and Astrophysics
Astronomy
2
Giant Stars, Iue, Spaceborne Astronomy, Stellar Flares, Ultraviolet Spectra, Chromosphere, Stellar Spectra
Scientific paper
High-resolution IUE spectra of the Mg II k line of HD 199178 were analyzed, applying spectral imaging techniques to derive an image of the chromospheric structure and to study the transient behavior of the chromosphere. All spectra in the IUE archives were uniformly reduced and analyzed. Results are compared with ground-based observations of the photosphere. Four ultraviolet flares on HD 199178 are observed; 3 of these occurred at roughly the same rotational phase. There is no clear phase-dependence of the SWP line fluxes, but there is for the Mg II k flux. The emission centroid of the Mg II k line varies in a quasi-sinusoidal fashion, presumably due to the rotation of a nonuniform chromosphere.
Neff James E.
Vilhu Osmi
Walter Fred M.
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