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Studies in Galactic Structure. I. a Preliminary Determination of the Space Distribution of the Blue Giants.
The Astrophysical Journal1953Vol. 118, pp. 318–318
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Abstract
Distances of a preliminary list of high4uminosity stars of classes have been determined spectroscopically. A total of twenty-seven separate large-scale clusterings, or aggregates, are catalogued. Seven of the aggregates, located between galactic longitudes 311 and 346 , define part of a spiral arm located between the sun and the galactic center, at a distance from the sun of around 1400 psc. This confirms the tentative identification of an inner arm announced earlier by Morgan, Sharpless, and Osterbrock. The arm in which the sun is located appears to branch into two; this is in qualitative agreement with the 21-cm H observations of Oort, van de Hulst, and Muller. A catalogue of some probable members of the aggregates is included.