Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263...87a&link_type=abstract
In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 87-90
Astronomy and Astrophysics
Astrophysics
1
Flare Stars, Iue, Stellar Radiation, Stellar Rotation, Ultraviolet Radiation, Chromosphere, Stellar Spectra
Scientific paper
The UV line spectrum of the spotted flare star EV Lac in its quiescent state was observed with IUE. The observed rotational modulation of chromospheric UV lines is in antiphase with the photospheric variations in visual light. The visual variation is due to a starspot region located near the pole of the star. The transition region lines (80,000 K less than T less than 200,000 K) show no variation. This may indicate a large extent in altitude of the transition region causing the emitting regions to be visible throughout the rotation.
Andersen Nils Byrial
Kjeldseth-Moe Olav
Pettersen Bjorn Ragnvald
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