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Science 11 August 1967:
Vol. 157. no. 3789, pp. 635 - 638
DOI: 10.1126/science.157.3789.635
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Articles

Infrared Stars

The interaction between stars and interstellar clouds produces "infrared stars" of two different kinds

Harold L. Johnson 1

1 The Lunar and Planetary Laboratory, University of Arizona, Tucson

Our searches for very cool stars have revealed three kinds of objects: very cool Mira stars, perhaps cooler than any of this type previously known; extremely dense interstellar clouds, more dense than any known heretofore; and, probably, cool circumstellar clouds that may be planetary systems in an early stage of formation.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)