| Astrophysics (Index) | About |
A slowly-pulsating B-star (SPB) is a type of pulsating variable star, which is a B-type star with a pulsation period on the order of half a day to five days. Their variability is low in visible light, greater in the ultraviolet. They are termed 53 Persei variables after the prototype star, 53 Persei. The pulsations at the surface are g-modes. For some SPB stars, a magnetic field has been detected (magnetic SPB stars). More of the known SPB stars might have such magnetic fields given that very specific observations are required to detect the fields. These, as all SPB stars, are of research interest.