Abstract
We present results of Submillimeter Array (SMA) and Very Large Array (VLA) studies of massive-star formation regions in the early stages of ionization. Molecular-line and ionized-gas observations at resolutions down to 0.3'' reveal the presence of rotation, infall, and/or outflow from parsec scales to <0.05 pc. The centers of star formation harbor small groups of massive (proto)stars at different evolutionary stages. These observations favor a picture in which: (i) Stars with M_⋆ > 15 M_⊙ form by accretion processes similar to those of lower-mass stars, but with significant ionization. (ii) The molecular cores from which these stars form continue accreting from their environment. (iii) Accretion to the star can continue past the onset of ionization.
