Ultraviolet variability of the solar analogue star Alpha Centauri A

Details Ultraviolet variability of the solar analogue star Alpha Centauri A Ultraviolet variability of the solar analogue star Alpha Centauri A

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.9117s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, July 1, 1989, p. 9117-9124.

Astronomy and Astrophysics

Astronomy

Binary Stars, Solar Neighborhood, Stellar Spectra, Ultraviolet Astronomy, Flux Quantization, Iue, Spaceborne Astronomy, Stellar Activity, Stellar Rotation

Scientific paper

Fifty-seven observations of the solar analogue Alpha Centauri A made by the IUE over a 3-year interval have been examined for variability. It is found that the UV continuum flux of this star in the 1715- to 1915-A range varies by as much as 19 percent. However, nearly all of this range in variability can occur within one stellar rotation period. Consequently, if Alpha Cen A undergoes a stellar activity cycle similar to that of the sun, the results indicate that the amplitude of this modulation is small, contrary to recently proposed empirical (theoretical) models of solar activity.

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