Six s of were obtained during the winter by with the . His measures of the third suggested that the of the star varied, and the subsequent plates have confirmed this. The spectrum is, in general, of the Orion type, ’ ꟾb, and in particular of ’s ꟾꟾꟾa, of which group the typical star is . The principal lines in the region of spectrum in good focus on our plates are due to oxygen, , , and .
— EDWIN BRANT FROST