A submillimeter study of the star-forming region NGC 7129

New molecular ((CO)-C-13 J = 3-2) and dust continuum (450 and 850 mum) maps of the NGC 7129 star-forming region are presented. The maps include the He rbig Ae/Be star LkH alpha 234, the far-infrared source NGC 7129 FIRS 2, and several other prestellar sources embedded within the molecular ridge. The data are complemented with (CO)-O-18 J = 3-2 spectra at several positions w ithin the mapped region. Both the submillimeter and the (CO)-C-13 emission show a similar morphology, displaying a sharp boundary toward the cavity. T he submillimeter maps also reveal a second source, SMM 2, which is not clea rly seen in any earlier data set. This is either a prestellar core or possi bly a protostar. Also, the highest continuum peak emission is identified wi th the deeply embedded source IRS 6 a few arcseconds away from LkHa 234. Th ese new 450 and 850 mum observations are combined with previous continuum o bservations of the three compact far-infrared sources in the field, in orde r to make fits to the spectral energy distributions and to obtain the sourc e sizes, dust temperatures, luminosities, and masses. For nine positions wh ere both (CO)-C-13 and (CO)-O-18 spectra are available, gas masses have bee n obtained and compared with masses derived from the continuum fluxes. The masses are found to be consistent, implying little or no CO depletion onto grains. The dust emissivity index is found to be low toward the dense compa ct sources, beta similar to1-1.6, and high, beta similar to 2.0, in the sur rounding cloud.