Long-term spectroscopic monitoring of Alpha Orionis

Details Long-term spectroscopic monitoring of Alpha Orionis Long-term spectroscopic monitoring of Alpha Orionis

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..221s&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 221-22

Astronomy and Astrophysics

Astrophysics

1

Chromosphere, Stellar Spectra, Supergiant Stars, Stellar Envelopes, Stellar Mass Ejection, Ultraviolet Spectroscopy

Scientific paper

Ultraviolet spectroscopy and optical photometry of Alpha Orionis (M2 Iab) have been obtained at approximately two-week intervals from January 1984 through April 1986. The ultraviolet (2950 Å - 3050 Å) and optical continua are found to vary in phase with each other. The Mg II h and k total emission flux is similarly modulated, but lags the optical light curve by about 0.25 years. However, the h and k line fluxes vary by different amounts and in a manner which suggests a periodicity of about one year. These and other spectral variations may be causally linked to atmospheric disturbances, possibly related to a close stellar companion.

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