OB stars

OB stars

Stars of spectral type O or B, i.e. O stars or B stars, all of which are ultraviolet stars.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
Around it are more OB stars, some of which may inhabit a looser, counterclockwise-moving disk.
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.
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.
These objects are thought to be associated with unseen optical nebulae and OB stars; thus I added H II regions at their locations.