The Spectrum of Nu Eridani

Abstract

Observations in 1953-1954 confirm de Jager's and our own interpretation of our previous velocity curves. The new results show that the absorption lines tend to be sharpest on the ascending branch near minimum and broadcast on the descending branch near maximum. Three cycles show pronounced departures from the velocity-curves predicted on the basis of two interfering harmonic oscillations. There are some indications that, in addition to P₁= 0.1779 day and P₂= 0.1735 day, there is a third period, P₃= 0.064 day and K₃= 5 km/sec.