  Luminous blue variables (LBVs) are evolved massive stars close to the
Eddington limit, with a distinct spectroscopic and photometric variability
having unsteady mass-loss rates. These stars show a considerable change in
their surface temperature from quiescent to outbursts phase. The cause of
irregular variability and unsteady mass-loss rate is not properly understood.
Here we present the result of linear stability analysis in two LBVs AF And and
R 127 during their quiescent and outburst phase. We note that several modes are
unstable in the models of the considered LBVs. Mode interaction is frequent in
the modal diagrams for the models of both LBVs. For AF And, number of
instabilities increase in models having temperature below 15000 K. The found
instabilities may be linked with the observed irregular variabilities and
surface eruptions. Observational facilities of Belgo-Indian Network for
Astronomy and Astrophysics (BINA) will be very beneficial to study the
spectroscopic and photometric behavior of the considered LBVs.
