Deneb is the prototype type A2 supergiant. Unfortunately, the literature detailing the variability of A-tpye supergiants is sparse. We are analyzing 339 spectra in the Hα wavelength region obtained at Ritter Observatory taken over the five-year span from 1997 through 2001. We also obtained during the same time period, 370 Strömgren photometric measurements at the Four College Automated Photoelectric Telescope.
The Hα profile of Deneb exhibits a characteristic P Cygni profile, consistent with mass-loss in Deneb. Dynamical spectra of the Hα profile were constructed to visually search for cyclic variability in the wind of the star. No clear evidence was found for this type of behavior.
Time–series analysis was performed to analyze the Hα net equivalent widths, radial velocities, and photometry using the CLEAN algorithm.
|School:||The University of Toledo|
|School Location:||United States -- Ohio|
|Source:||MAI 57/05M(E), Masters Abstracts International|
|Keywords:||Deneb, Stars, Supergiants, Time series analysis, Variable stars|
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