Periodic modulation of the atmosphere of Alpha Orionis

Details Periodic modulation of the atmosphere of Alpha Orionis Periodic modulation of the atmosphere of Alpha Orionis

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.365d&link_type=abstract

In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 365-368 (SEE N89-10682 01-89)

Astronomy and Astrophysics

Astronomy

3

Iue, Spaceborne Astronomy, Stellar Atmospheres, Supergiant Stars, Ultraviolet Astronomy, Ultraviolet Spectra, Periodic Variations, Stellar Mass Ejection, Stellar Spectra

Scientific paper

Alpha Orionis (Betelgeuse; M2 Iab) was monitored with IUE since 1984. Discovery of a 420-day periodic modulation of the flux in the optical and ultraviolet continua, and in the Mg II h and k line emission cores suggests that periodic photospheric pulsations were present from 1984 to 1986. This behavior continues through 1987. However, the general flux level of the ultraviolet continuum and the Mg II lines is decreasing, and the amplitude of the variation may be reduced. These decreases may be the emerging signature of an additional longer period. The density sensitive C II diagnostic, 2325.4/2328.1, indicates the chromospheric densities range between log Ne (cm-3) = 8.7 and 9.5, but periodicities are not evident.

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