5-year spectroscopy and photometry of Deneb

Deneb is often considered the prototypical A-type supergiant and is one of the visually most luminous stars in the Galaxy. A-type supergiants are potential extragalactic...天津四（Deneb）通常被视为典型的A型超巨星，亦是银河系中视觉亮度最高的恒星之一。A型超巨星是潜在的河外……