OB stars

OB stars

Stars of spectral type O or B, i.e. O stars or B stars, all of which are ultraviolet stars.
References in periodicals archive ?
Many of the simulation's heaviest stars either merged or escaped, which might explain why the Orion cluster only has 10 OB stars instead of the expected 40.
OB stars are associated with HII regions and, though not mentioned much in this book, PAH (polycyclic aromatic hydrocarbons) emissions.
Opening invited reviews provide an overview of active OB stars, discuss rotation and the circumstelllar environment, and explore statistical inference of the Be star periodicity.