Evidence for dynamical changes in Betelgeuse using multi-wavelength data

Autor:	Kachhara, Sneha, George, Sandip V., Misra, Ranjeev, Ambika, G.
Rok vydání:	2021
Předmět:	Astrophysics - Solar and Stellar Astrophysics Nonlinear Sciences - Chaotic Dynamics
Druh dokumentu:	Working Paper
Popis:	The reasons behind the Great Dimming and subsequent rising in the brightness of Betelgeuse between October 2019 and March 2020 still continue to baffle astronomers. It has been shown by George et. al. (2020) that critical slowing down preceded the dimming event. This suggested that the dimming was a result of the change in the nature of the nonlinear dynamics of the star. In this work we present additional evidence for dynamical changes in Betelgeuse prior to the Great Dimming event, using nonlinear time series analysis. We study the relations between the different bands in the photometry data collected from the Wing photometry (IR/near-IR) and Wasatonic observatory (V-band). We also analyse how the early warning signals studied previously changed during and after the Great Dimming. Comment: 9 pages, 4 figures, Contribution to the Proceedings of the Sixteenth Marcel Grossmann Meeting (MG16), July 5-10, 2021
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2111.09218 Zobrazit plný text záznamu View this record from Arxiv