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Spectral images of HD 199178High-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.
Document ID
19890001368
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Neff, J. E. (NASA Goddard Space Flight Center Greenbelt, MD., United States)
Vilhu, O. (Helsinki Univ. (Finland). Boulder., United States)
Walter, F. M. (Colorado Univ.)
Date Acquired
September 5, 2013
Publication Date
June 1, 1988
Publication Information
Publication: ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1
Subject Category
Astronomy
Accession Number
89N10739
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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