Title: Estimating the chromospheric magnetic field from a revised NLTE modeling: the case of HR7428,
Abstract: In this work we use the semi-empirical atmospheric modeling method to obtain
the chro-mospheric temperature, pressure, density and magnetic field
distribution versus height in the K2 primary component of the RS CVn binary
system HR 7428. While temperature, pressure, density are the standard output of
the semi-empirical modeling technique, the chromospheric magnetic field
estimation versus height comes from considering the possibility of not
im-posing hydrostatic equilibrium in the semi-empirical computation. The
stability of the best non-hydrostatic equilibrium model, implies the presence
of an additive (toward the center of the star) pressure, that decreases in
strength from the base of the chromosphere toward the outer layers.
Interpreting the additive pressure as magnetic pressure we estimated a magnetic
field intensity of about 500 gauss at the base of the chromosphere.