  In the framework of an extended bag model the magnetic moments, M1 transition
moments, and decay widths of all ground-state heavy hadrons are calculated. For
the heavy baryons containing three quarks of different flavors the effect of
hyperfine mixing of the states is taken into account. The additional care is
taken to get more accurate theoretical estimates for the mass splittings of
heavy hadrons. The use of such improved values enables one to provide more
accurate predictions for the decay widths. These values of the hyperfine
splittings between baryons may be also useful for the further experimental
searches of new heavy hadrons. For instance, we predict
$M(\Xi_{cc}^{*})=3695\pm5$ MeV. The agreement of our results for the M1 decay
rates with available experimental data is good. We also present a wide
comparison of the predictions obtained in our work with the results obtained
using various other approaches.
