Optical and ultraviolet observations of FK Comae stars

Details Optical and ultraviolet observations of FK Comae stars Optical and ultraviolet observations of FK Comae stars

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.218..355b&link_type=abstract

In ESA Fourth European IUE Conf. p 355-358 (SEE N84-35135 24-88)

Computer Science

4

Giant Stars, Late Stars, Light Curve, Stellar Evolution, Stellar Rotation, Stellar Spectra, Chromosphere, Iue, Stellar Activity, Ultraviolet Spectroscopy, Visible Spectrum

Scientific paper

The IUE observed the FK Comae and HD32918, a suggested member of the FK Comae class in the southern sky, around one minimum and one maximum of the light curve, to study chromospheric and transition zone lines dependence on the (orbital) phase. As the amplitude of the optical light curve is variable, and the stars frequently undergo flaring, ground based photometric coverage was secured around the time of the IUE observations, to know the state of activity of the stars. The IUE spectra reveal strong phase-dependent variations of the higher temperature lines, while the MgII lines do not vary. However, the strength of the MgII emission in FK Comae compared with that found in previous observations taken from the IUE archive, show that the intensity changed by a factor of 2.

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