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Title:
Unusual features of the 1-4 micron spectrum of HR 4049
Authors:
Geballe, T. R.; Noll, K. S.; Whittet, D. C. B.; Waters, L. B. F. M.
Affiliation:
AA(Joint Astronomy Center, Hilo, HI), AB(Arizona, University, Tucson, AZ), AC(York University, Downsview; Toronto, University, Canada), AD(Amsterdam, Universiteit, Netherlands)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 340, May 1, 1989, p. L29-L32. Research supported by SERC, NSERC, and Niels Stensen Foundation. (ApJL Homepage)
Publication Date:
05/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Active Galactic Nuclei, Astronomical Spectroscopy, Interstellar Chemistry, Pre-Main Sequence Stars, Cosmic Dust, Early Stars, Emission Spectra, Stellar Envelopes, Ultraviolet Radiation
DOI:
10.1086/185431
Bibliographic Code:
1989ApJ...340L..29G

Abstract

Moderate resolution spectra from 1.05 to 3.65 microns of the post-AGN star HR 4049 show a number of features indicative of intense mass loss and unusual circumstellar chemistry. These are deep Brackett series absorption lines to rather high n states, emission in the 3.29 and 3.40 microns 'dust' features, and the rarely occurring emission features near 3.5 microns. HR 4049 is only the third star in which the 3.5micron features have been reported; the other two stars are premain-sequence objects. The physical and chemical conditions for the production of the (unknown) molecule responsible for this emission appear to be highly constrained.

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