Spectroscopic observations of the δ Scorpii binary during its recent periastron passage
Spectroscopic observations of the δ Scorpii binary during its recent periastron passage
The bright star delta Sco has been considered a typical B0-type object for many years. Spectra of the star published prior to 1990 showed no evidence of emission, but only of short-term line profile variations attributed to nonradial pulsations. Speckle interferometric observations show that delta Sco is a binary system …