Abstract
Hot Molecular Cores (HMCs) are dense molecular clumps with T gtrsim 100 K, found in the proximity of ultracompact H II (UCHII) regions. It is believed that HMCs are envelopes infalling onto a central high-mass protostar. Osorio, Lizano, & D'Alessio (1999) modeled in detail their spectral energy distribution (SED) from dust emission, and obtained their physical parameters.
