Chromospheric Activity, Tio Strength and Spectral Types in M Giants

Details Chromospheric Activity, Tio Strength and Spectral Types in M Giants Chromospheric Activity, Tio Strength and Spectral Types in M Giants

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1883s&link_type=abstract

IUE Proposal ID #CSGTS

Computer Science

Scientific paper

In an continuation of a study begun during the 6th year of the IUE guest observer program the IUE satellite will be used to study the ultraviolet spectra of cool giant stars that have well-determined angular diameters and effective temperatures. The stars to be observed have spectral classes ranging from K3 through M6 and are of luminosity class III. Low resolution observations in the long wavelength region will be made in order to study the photospheric continuum radiation in the UV and to determine the level of chromospheric activity in these stars. The absolute flux, as well as the slope of the continuum in the wavelength region 2200-3000 A, should be a sensitive probe of the extent of nonradiative heating in the upper photosphere. Chromospheric activity will be examined for the range of spectral subclasses observed to determine if the degree of chromospheric activity differs for stars of the same effective temperature. The Possibility exists that such a differential level of chromospheric activity could lead to the inhibition of TiO formation in the upper photosphere. Preliminary results from IUE observations made during this past year appear to support this hypothesis. This possibility will be examined along with the resultant consequences for comparisons of observed TiO bandstrengths with model predictions.

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