The EUV line flux variations and activity in Alpha Orionis

Details The EUV line flux variations and activity in Alpha Orionis The EUV line flux variations and activity in Alpha Orionis

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.270..337e&link_type=abstract

In ESA, Proceedings of the 8th ESA Symposium on European Rocket and Balloon Programs and Related Research p 337-340 (SEE N88-162

Astronomy and Astrophysics

Astronomy

Extreme Ultraviolet Radiation, Stellar Activity, Stellar Radiation, Supergiant Stars, Ultraviolet Astronomy, Variations, Iue, Stellar Magnitude, Ultraviolet Spectroscopy

Scientific paper

Studies of the red, bright supergiant star Alpha Orionis, using the IUE over an eight-year period show significant variations in the EUV line fluxes of the star. Neither the long term cyclic variation in radial velocity and in visual brightness, nor the relative position of the orbiting inner stellar companion of the triplet stellar system, seem to be connected with observed fluctuations in EUV line fluxes. Short term fluctuations in optical brightness (B magnitude) believed to be associated with transient (active) regions in the atmosphere of the star, are well correlated with EUV line flux variations.

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