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UKIRT CGS3 Observations of New IRAS 21 Micron Sources

Published online by Cambridge University Press:  07 August 2017

Sun Kwok ,
Bruce J. Hrivnak ,
Tom R. Geballe  and
Phillip L. Langill
Sun Kwok
Affiliation:
Dept. of Physics & Astronomy, University of Calgary, Calgary, Canada
Bruce J. Hrivnak
Affiliation:
Dept. of Physics & Astronomy, Valparaiso Univerity, Indiana, U.S.A.
Tom R. Geballe
Affiliation:
Joint Astronomy Center, Hilo, Hawaii, U.S.A.
Phillip L. Langill
Affiliation:
Dept. of Physics & Astronomy, University of Calgary, Calgary, Canada

Extract

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An unidentified emission feature at 21 μm has been detected in the IRAS Low Resolution Spectra (LRS) of 5 IRAS sources (Kwok, Volk, and Hrivnak 1989, Hrivnak and Kwok 1991). The sources are generally found to be F and G supergiants with cool, detached dust shells. We have searched for additional 21 μm sources in the LRS database and have obtained ground-based UKIRT spectra at 10 and 20 μm in an attempt to confirm the LRS feature.

Type
IV. Planetary Nebulae Connection: Evolution from the AGB
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 342
Copyright
Copyright © Kluwer 1993 

References

Geballe, T.R., Tielens, A.G.G.M., Kwok, S., & Hrivnak, B.J. 1992, ApJ , 387, L89 CrossRefGoogle Scholar
Hrivnak, B.J., & Kwok, S. 1991, ApJ , 368, 564 CrossRefGoogle Scholar
Kwok, S., Volk, K., Hrivnak, BJ. 1989, ApJ , 345, L51 CrossRefGoogle Scholar