  We present the high precession photometric studies in V band and
spectroscopic studies centered around H-alpha line for two extreme mass-ratio
short period contact binaries ASAS J082243+1927.0 (V1) and ASAS J085710+1856.8
(V2). The variables in study are in the direction of open cluster Praesepe.
From the light curve analysis V1 was found to be a low mass-ratio over-contact
binary of A-type, with a mass ratio q 0.121 and fill-out factor f 72%, and V2
was found to be a low mass contact binary of W-type, with a mass-ratio q 1.29
and fill-out factor f 11% (marginal contact). The study of H-alpha absorption
line profile of both the variables shows variation in equivalent widths (EWs)
with orbital phases. The mean EWs of the H-alpha line were obtained as
1.6+or-0.13 A and 1.18+or-0.12 A for V1 and V2 respectively. The variation of
H-alpha absorption with respect to phase is explained to be due to
chromospheric activity in V1, as evident from the O Connell effect and that due
to chromospheric flares, winds or photospheric source in V2. The parameters for
both the binaries are also studied with respect to the large sample of
well-studied contact binaries and possible mechanisms for merger in contact
binaries of both low and high mass ratios emphasized.
