Abstract
view Abstract Citations (46) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Carbon-rich Proto--Planetary Nebula IRAS 22272+5435 Hrivnak, Bruce J. ; Kwok, Sun Abstract Ground-based photometry and spectroscopy is presented for IRAS 22272 + 5435, a 9th mag star with a large infrared excess. The flux distribution is 'double-peaked', with a visible and near-infrared component due to the reddened photosphere and a far-infrared component presumably due to a detached dust shell. About equal amounts of energy are detected from each. The spectrum is that of a peculiar G supergiant, Gp Ia. In addition, strong molecular bands of C3 and C2 are observed. The flux distribution is modeled and, together with published molecular-line radio observations, allows the determination of basic parameters of the central star and the dust shell. The source has the characteristics one would expect of a proto-planetary nebula, an object in transition from the asymptotic giant branch to the planetary nebula phase. Publication: The Astrophysical Journal Pub Date: April 1991 DOI: 10.1086/169928 Bibcode: 1991ApJ...371..631H Keywords: Infrared Sources (Astronomy); Planetary Nebulae; Protoplanets; Stellar Envelopes; Stellar Spectra; Astronomical Photometry; Astronomical Spectroscopy; Carbon; Infrared Astronomy Satellite; Astrophysics; INFRARED: SOURCES; NEBULAE: INDIVIDUAL ALPHANUMERIC: IRAS 22272; 5435; NEBULAE: PLANETARY; STARS: CIRCUMSTELLAR SHELLS full text sources ADS | data products SIMBAD (6)
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