with the head of the CN band, and also an enhanced G band due to CH and possibly CN. There are some supergiant stars with these BA II, strontium lines and CN band, but the G and K-type stars Bidelman and Keenan described did not appear to be supergiants. G, K, and M-type giants, the most complex area of the Hertzsprung–Russell diagram (HR) diagram, have spectra so complicated "many astronomers have shied away from studying them". Eventually, Robert McClure discovered that essentially all barium stars began with a companion star that made the s-process elements, and when the companion star aged into a white dwarf, a stellar wind moved what was made by one star to the other star, a shifting of mass from an Asymptotic giant branch(AGB) star that turned into a white dwarf, to its companion star. Bidelman was the first to find three unusual A- and F-type high-latitude bright stars, HR 6144, 89 Herculis, and HD 161796 in the high galactic plane, an unexpected place for supergiant stars to be found. Astronomers expect to find massive young stars that are five to twenty times the mass of the Sun, on the galactic plane, a place where stars form, but it is rare to find stars like Her 89, with a spectrum that appears to be a young supergiant so far from the Galactic plane. Regarding these stars with characteristics of Population I supergiants, yet found at high galactic latitude, another astronomer wrote, "If I were a theoretician, I would simply say, 'They can't be, therefore they aren't'". Bidelman's 1951 study also isolated the G- and K-type giant stars with weak G-bands as a class of peculiar giants. University of California, Lick Observatory (1953–1963) In October 1953, Bidelman was hired as an assistant astronomer at Lick Observatory. This observatory of the University of California is located on Mount Hamilton (California). The Bidelman family lived on Mount Hamilton and the children attended a one-room school where it was an hour's drive to the nearest grocery store. According to Stanislaus Vasilevskis, due to the lack of a high school for children and other features, Bidelman moved from Mount Hamilton to San Jose, and commuted to work. Otto Struve had left the Chicago for The University of California in 1950. Bidelman lectured for Struve's Graduate Seminar on Astrophysics at Berkeley in 1955. He and George Herbig also gave ten lectures together