  We explore the scenario of a Coronal Mass Ejection (CME) being the cause of
the observed continuous X-ray absorption of the August 30 1997 superflare on
the eclipsing binary Algol (the Demon Star). The temporal decay of the
absorption is consistent with absorption by a CME undergoing self-similar
evolution with uniform expansion velocity. We investigate the kinematic and
energetic properties of the CME using the ice-cream cone model for its
three-dimensional structure in combination with the observed profile of the
hydrogen column density decline with time. Different physically justified
length scales were used that allowed us to estimate lower and upper limits of
the possible CME characteristics. Further consideration of the maximum
available magnetic energy in starspots leads us to quantify its mass as likely
lying in the range $2\times 10^{21}$-$2\times 10^{22}$ g and kinetic energy in
the range $7\times 10^{35}$-$3\times 10^{38}$ erg. The results are in
reasonable agreement with extrapolated relations between flare X-ray fluence
and CME mass and kinetic energy derived for solar CMEs.
