Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317l..85d&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 317, June 15, 1987, p. L85-L89. SERC-ESA-supported
Astronomy and Astrophysics
Astronomy
40
Chromosphere, Periodic Variations, Photosphere, Stellar Oscillations, Supergiant Stars, Cool Stars, Emission Spectra, Stellar Rotation, Stellar Spectrophotometry, Ultraviolet Astronomy
Scientific paper
The bright cool supergiant Alpha Orionis has been monitored spectroscopically and photometrically over the past three years (1984-1986) in the optical and the ultraviolet wavelength regions. A 420-day periodic modulation of the flux is observed in the optical and ultaviolet continua, and in the Mg II line emission cores. Periodic photospheric pulsations are the most likely explanation of these observations. This identification is based on the large amplitude of the variation, the correlation of the continuum and chromospheric fluxes, and the length of the observed period. Pulsation may heat and extend the atmosphere of Alpha Ori and initiate the mass flow from the star.
Baliunas Sallie L.
Dupree Andrea K.
Guinan Edward F.
Hartmann Lee
Nassiopoulos George E.
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