1) General: The act or state of growing together, as similar parts;
the act of uniting by natural affinity or attraction; the state of being united.
Verbal noun from → coalesce.
Fr.: modèle de coalescence
A scenario for building up → massive stars through merging of → intermediate-mass protostars. It occurs in the cores of dense stellar clusters that have undergone core contraction due to rapid → accretion of gas with low → specific angular momentum. The required densities are, however, very high, 108 stars pc-3, which are extremely rare (Bonnell et al. 1998, MNRAS 298, 93).