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Title:
4-8 micron spectrophotometry of OH 0739-14
Authors:
Soifer, B. T.; Willner, S. P.; Rudy, R. J.; Capps, R. W.
Affiliation:
AA(California Institute of Technology, Pasadena, CA), AB(California, University, La Jolla, CA), AC(California, University, La Jolla, CA), AD(Hawaii, University, Honolulu, HI)
Publication:
Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 631-635. NASA-NSF-supported research. (ApJ Homepage)
Publication Date:
11/1981
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Hydroxyl Emission, Infrared Astronomy, Late Stars, Stellar Spectra, Stellar Spectrophotometry, Water Masers, Infrared Spectra, Interstellar Matter, Molecular Clouds, Stellar Envelopes
DOI:
10.1086/159410
Bibliographic Code:
1981ApJ...250..631S

Abstract

Spectrophotometry of the dust-embedded late-type star OH 0739-14 shows an absorption feature at 6.0 microns characteristic of H2O ice at temperatures significantly lower than 150 K, confirming the identification of H2O ice in the circumstellar shell in this source. The differences in the infrared spectra of HO 0739-14 and embedded molecular cloud sources are attributed to the different cloud lifetimes and temperature regimes in which the molecules are formed. A lower limit to the mass loss rate of 0.0001 solar mass per year is derived, based on the column density of ice and the size and the expansion velocity of the circumstellar cloud.

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