Unusual 3 micron emission features in three proto-planetary nebulae

Details Unusual 3 micron emission features in three proto-planetary nebulae Unusual 3 micron emission features in three proto-planetary nebulae

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387l..89g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 387, March 10, 1992, p. L89-L91. Research supported by NASA.

Astronomy and Astrophysics

Astronomy

85

Asymptotic Giant Branch Stars, Infrared Sources (Astronomy), Planetary Nebulae, Red Giant Stars, Stellar Envelopes, Stellar Evolution, H Ii Regions, Infrared Astronomy Satellite, Spectral Emission, Stellar Spectrophotometry, Vibration Mode

Scientific paper

Medium-resolution 3-4 micron spectra have been obtained of three objects, IRAS 04296 + 3429, IRAS 22272 + 5435, and CRL 2688, which are in transition between the asymptotic red giant branch and the planetary nebula phase. All three show unusual 3-micron emission features. The two IRAS objects, already unusual in having 21 micron features, have remarkably strong 3.4-3.5 micron emission relative to the usually dominant 3.3-micron feature, with the spectrum of IRAS 04296 + 3429 being nearly identical to that of IRAS 05341 + 0852 (previously published). CRL 2688's spectrum bears some resemblance to those of the IRAS objects, but its 3.4-3.5 micron emission is not as strong. The relationships between the various emission features are discussed. CRL 2688 may be completing a transition between the '21-micron phase' and the 'normal phase', which is associated with dominant 3.3-micron emission, weak 3.4-3.6 micron features and plateau, and a lack of 21-micron emission.

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