  In this work we have employed Bethe-Salpeter equation (BSE) under covariant
instantaneous ansatz (CIA) to study electromagnetic decays of ground state
equal mass vector mesons: $\rho$, $\omega$, $\phi$, $\psi$ and $Y$ through the
process $V\rightarrow\gamma*\rightarrow e^+ + e^-$. We employ the generalized
structure of hadron-quark vertex function $\Gamma$ which incorporates various
Dirac structures from their complete set order-by-order in powers of inverse of
meson mass. The electromagnetic decay constants for the above mesons are
calculated using the leading order (LO) and the next-to-leading order (NLO)
Dirac structures. The relevance of various Dirac structures in this calculation
is studied.
