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Deneb is a Large Amplitude Polarimetric Variable by Cotton, Daniel V.; Bailey, Jeremy; Perkins, Jean; Buzasi, Derek L.; Boiko, Ievgeniia is a scholarly article available to read on EtoBox.

What is Deneb is a Large Amplitude Polarimetric Variable about?

We write to report the discovery that Deneb is a large amplitude polarization variable. Over a ~400 d time span from August 2022 Deneb's polarization was typically around 3900 parts-per-million (ppm) in the SDSS g'-band. Yet, it varied by several hundred ppm in an irregular way on a timescale of weeks. The largest polarization change, amounting to 2500 ppm, occurred shortly after the last pulsation ``resumption'' event identified by Abt et al. (2023) in TESS photometry. The relationship between the observed polarization -- particularly corresponding to the resumption event -- and its brightness and H-alpha spectra suggests a mechanism involving density changes in its wind and/or extended atmosphere. Smaller effects due to pulsations are not ruled out and further study is recommended.

Author

Cotton, Daniel V.; Bailey, Jeremy; Perkins, Jean; Buzasi, Derek L.; Boiko, Ievgeniia

Published

2024

Language

EN