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New OH/IR Stars: Proto-Planetary Nebulae?

Published online by Cambridge University Press:  19 July 2016

J. Eder
Affiliation:
Yale University
B. M. Lewis
Affiliation:
NAIC, Arecibo Observatory
Yervant Terzian
Affiliation:
NAIC, Cornell University

Abstract

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The IRAS infrared colors, (60 - 25)μm and (25 - 12)μm, allow efficient identification of Type II OE/IR stars. We present Arecibo1 OH (1612 MHz) observations of 474 IRAS point sources chosen to define the exact regions of the two-color diagram occupied by OH/IR stars. Our observations are complete within the boundary regions of the two-color locus and within the region, 16h right ascension < 22h, 0° < declination < 37°. The sensitivity of the Arecibo telescope allows the identification of many weak sources that would not have been detected by previous surveys and the weak end of the masing phenomenon has been studied for the first time.

Type
V. Origin of Planetaries
Copyright
Copyright © Kluwer 1989