Of Variability, or its Absence, in HgMn Stars
  Current models and observations of variability in HgMn stars disagree. We present here the models that argue for pulsating HgMn stars with properties similar to those of Slowly Pulsating B Stars. The lack of observed variable HgMn stars suggests that some physical process is missing from the models. Some possibilities are discussed. 
S. Turcotte (1) and O. Richard (2) ((1) Lawrence Livermore National   Laboratory, (2) Departement de physique, Universite de...