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Published July 1965 | Published
Journal Article Open

Observations of Extremely Cool Stars


As one part of a program of infrared astronomy carried on at the California Institute of Technology, a survey of the sky in two infrared spectral ranges, 0.68-0.92 μand 2.01- 2.41 μ, is being carried out. The motivation for such a survey is to obtain an unbiased census of objects that emit in the 2.0-2.5-μ atmospheric window; this will, of course, include many ordinary stars, but it might also reveal many potentially interesting objects that would not be included in an a priori selection of objects to be measured. In fact, a number of strikingly red stars have already been found. Since most of these "superred" stars occur in the Milky Way, interstellar reddening may be of some consequence; but in at least a few cases the stars seem to be intrinsically extremely red. These preliminary results seem of sufficient interest to merit brief description at this time.

Additional Information

© 1965 American Astronomical Society. April 16, 1965. This work is supported in part by NASA grant NsG 426. We gratefully acknowledge the able assistance of Dr. Bruce T. Ulrich, E. E. Becklin, G. Fitzpatrick, E. Hughes, Mrs. P. Kuhi, D. McCammon, J.E. Nelson, and J. Westphal in the construction and operation of the survey system.

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Published - 1965ApJ___142__399N.pdf


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