High-Energy Phenomena in STARS Stars (review Paper)

Superionization, stellar winds, and high-energy emission in Be stars are discussed. The broad asymmetric absorption profiles, mass-loss rates, and discrete absorption components pertaining to the stellar winds are considered, and comparisons with OB stars are made. It is concluded that high-energy phenomena in Be stars are associated with the Be phenomeon itself, and that these phenomena are either latitude-dependent or initiated by rotation, or both. Ths similarities between these high-energy phenomena and those in OB stars suggests that radiation pressure may play a role in driving the Be star winds, but differences between Be and OB stars indicate that some other factor must also be involved in Be stars.