Spectroscopic periodicities and their connection to polarimetric variability

Ascertain periodicities in the Hα and Hβ line-core shifts relative to photospheric lines in Deneb’s spectrum and characterize their connections to broadband polarization variations by acquiring an extensive spectroscopic time series suitable for meaningful periodicity analysis.

Background

The authors observe additional absorption features and line-core shifts in Hα and Hβ near times of significant polarization deviations, suggesting possible wind-related events. However, the current spectroscopic dataset is limited in coverage.

They explicitly state that their spectroscopic data are not yet sufficient to search for periodicities or connections, leaving open the task of determining whether spectroscopic features exhibit periodic behavior and how they correlate with polarimetric changes.