A set of partition functions and equilibrium constants for 300 diatomic molecules of astrophysical interest

Polynomial developments for partition functions and equilibrium constants of 300 diatomic molecules and of relevant atoms are given for a temperature range from 1000 to 9000K. All molecular spectroscopic data, with a few exceptions, are derived from the book by Huber and Herzberg in order to lead to a homogeneous set of data.