Variability of cool stars at optical and ultraviolet wavelengths

Details Variability of cool stars at optical and ultraviolet wavelengths Variability of cool stars at optical and ultraviolet wavelengths

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176..165l&link_type=abstract

In ESA 3rd European IUE Conf. p 165-167 (SEE N83-11889 02-88)

Physics

1

Binary Stars, Cool Stars, Flare Stars, Light Curve, Line Spectra, Stellar Flares, Variability, Boundary Layer Transition, Chromosphere, Iue, Ultraviolet Spectra

Scientific paper

Ground based optical, and IUE observations of AU Mic are described. One definite flaring event, remarkable changes of the BY Dra-type optical light curve and evidence of slow variability in the chromospheric and transition region line fluxes (probably due to the rotational modulation of photospheric starspots and plages, respectively), was found. The fractional surface area covered by active regions (filling factor) shows a definite variability with the temperature of line formation, i.e., with atmospheric height. This suggests significant surface and vertical structuring of active regions in the outer atmosphere of AU Mic.

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