Periodicities in the Ultraviolet Flux of α Orionis

Details Periodicities in the Ultraviolet Flux of α Orionis Periodicities in the Ultraviolet Flux of α Orionis

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasp..112..977r&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 112, Issue 773, pp. 977-982.

Astronomy and Astrophysics

Astronomy

3

Stars: Agb And Post-Agb, Stars: Individual (Α Orionis), Ultraviolet: Stars

Scientific paper

We have used low-resolution spectra from the International Ultraviolet Explorer (IUE) to look for periodicities in the ultraviolet flux from α Orionis. The total continuum flux for each observation was integrated, producing longwave (1900-3200 Å) and shortwave (1250-1750 Å) light curves. The periodograms resulting from the shortwave data are noiselike, but the longwave light curves yield statistically significant periods of T1=3.46 yr and T2=0.531 yr. From the shortwave data, we found no statistically significant periods. Both periods are further supported by harmonic fits and data folding. We discuss the possible implications of these periodic fluctuations, specifically in regards to pulsation, convection, and binarity.

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