Abstract
The spectrum of the irregular variable ρ Cassiopeiæ has been variously classified as G7 (Victoria), cG0 (Mt. Wilson), F8p (Yerkes) and F8p (Harvard), the last classification being accompanied by the note “the spectrum resembles class K0 in the region of Hβ” The classifications agree in attributing the spectrum to a supergiant with a luminosity about 1,500 times that of the sun, while the surface temperature varies irregularly in periods of the order of 200—1,000 days, about an average not far from the solar value of 6,000° K.
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References
Harvard Announcement Card, 752 (June 11, 1946).
"Moleculspektren", 1, 35 (Springer, 1935).
Ladenburg, R., Phys. Z., 30, 369 (1929).
ter Haar, D., Bull. Ast. Inst. Netherlands, No. 361 (1943); Mon. Not. Roy. Ast. Soc., 106 (1946).
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THACKERAY, A. Spectrum of ρ Cassiopeiæ. Nature 160, 370–371 (1947). https://doi.org/10.1038/160370b0
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DOI: https://doi.org/10.1038/160370b0
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