SIMBAD references

From numerical simulations of massive and luminous stars, we often find regular radial pulsations for a large variety of stellar parameters. The pulsation periods are typically around one day. Such pulsations are encountered during the core hydrogen burning as well as during the early core helium burning stage of evolution. The numerical results are discussed with the aim to guide observations to identify and monitor such regularly pulsating variable massive stars in nature. We emphasise that mass loss events generating circumstellar shells, complex atmospherical motions and angular variations due to stellar rotation can strongly modify the actually observable light curves.