Context. This paper is dedicated to the study of the chemistry of the intermediate-mass (IM)
hot core NGC 7129 FIRS 2, probably the most compact warm core found in the 2− 8 M⊙
stellar mass range. Aims. Our aim is to determine the chemical composition of the IM hot
core NGC 7129 FIRS 2, and to provide new insights on the chemistry of hot cores in a more
general context. Methods. NGC 7129 FIRS 2 (hereafter, FIRS 2) is located at a distance of
1250 pc and high spatial resolution observations are required to resolve the hot core at its …

NGC 7129 FIRS 2 (hereafter FIRS 2) is an intermediate-mass (2 to 8 Msun) protostar located
at a distance of 1250 pc. High spatial resolution observations are required to resolve the hot
core at its center. We present a molecular survey from 218200 MHz to 221800 MHz carried
out with the IRAM Plateau de Bure Interferometer. These observations were complemented
with a long integration single-dish spectrum taken with the IRAM 30m telescope. We used a
Local Thermodynamic Equilibrium (LTE) single temperature code to model the whole …