Study of Instabilities and Outbursts in the Luminous Blue Variables AF And and R 127
2024
Abhay Pratap Yadav | Sugyan Parida | Yogesh Chandra Joshi | Santosh Joshi
Luminous blue variables (LBVs) are evolved massive stars close to the Eddington limit, exhibiting distinct spectroscopic and photometric variability having unsteady mass-loss rates. These stars undergo considerable changes in their surface temperature from quiescent to outburst phases. The cause of this irregular variability and unsteady mass-loss rate is not fully understood. Here we present the results of a linear stability analysis in two LBVs AF And and R 127 during their quiescent and outburst phases. We observe that several modes are unstable in the models of the considered LBVs, with mode interaction being common in the modal diagrams for the models of both LBVs. For AF And, the number of instabilities increases in models with temperature below 15000 K. These found instabilities may be linked to the observed irregular variabilities and surface eruptions. The observational facilities of the BINA network will be highly beneficial for studying the spectroscopic and photometric behaviour of the considered LBVs.
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