  We consider row sequences of (type II) Hermite-Pad\'e approximations with
common denominator associated with a vector ${\bf f}$ of formal power
expansions about the origin. In terms of the asymptotic behavior of the
sequence of common denominators, we describe some analytic properties of ${\bf
f}$ and restate some conjectures corresponding to questions once posed by A. A.
Gonchar for row sequences of Pad\'e approximants.
