A 21 micron emission feature in four proto-planetary nebulae

• DOI: 10.1086/185550
• Publication Date: 2002-07-26T18:29:02Z
• Authors: Sun Kwok; Kevin M. Volk; Bruce J. Hrivnak
• Keywords: Asymptotic giant branch; Circumstellar envelope; Carbon star; Bipolar nebula; Circumstellar dust

view Abstract Citations (241) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A 21 Micron Emission Feature in Four Proto--Planetary Nebulae Kwok, Sun ; Volk, Kevin M. Hrivnak, Bruce J. The discovery of an unidentified emission feature at microns the LRS spectra four IRAS sources is reported. These objects all show large FIR excesses due to a circumstellar dust envelope surrounding carbon-rich central star and are likely be evolutionary phase between asymptotic giant branch planetary nebula stages. strength carbon richness suggest that this bending mode transient carbon-bearing molecule. Publication: Astrophysical Journal Pub Date: October 1989 DOI: 10.1086/185550 Bibcode: 1989ApJ...345L..51K Keywords: Astronomical Spectroscopy; Infrared Sources (Astronomy); Planetary Nebulae; Protoplanets; Stellar Evolution; Asymptotic Giant Branch Stars; Carbon; Cosmic Dust; Astronomy Satellite; Spectral Energy Distribution; Envelopes; Astrophysics; INFRARED: SOURCES; NEBULAE: PLANETARY; STARS: CIRCUMSTELLAR SHELLS; EVOLUTION full text ADS | data products SIMBAD (5)