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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358743.0, MPI für Astronomie / Publikationen_mpia
Diffraction-limited 3 µm spectroscopy of IRAS 04296+3429 and IRAS 05341+0852: spatial extent of hydrocarbon dust emission and dust evolutionary sequence
Authors:Goto, M.; Kwok, S.; Takami, H.; Hayashi, M.; Gaessler, W.; Hayano, Y.; Iye, M.; Kamata, Y.; Kanzawa, T.; Kobayashi, N.; Minowa, Y.; Nedachi, K.; Oya, S.; Pyo, T. S.; Saint-Jacques, D.; Takato, N.; Terada, H.; Henning, T.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Start Page:389
End Page:394
Audience:Not Specified
Abstract / Description:We present 3 mum spectroscopy of the carbon-rich protoplanetary nebulae IRAS 04296+3429 and IRAS 05341+0852, conducted with the adaptive optics system at the Subaru Telescope. We utilize the nearly diffraction-limited spectroscopy to probe the spatial extent of the hydrocarbon dust emitting zone. We find a hydrocarbon emission core extending up to 100-160 mas from the center of IRAS 04296+3429, corresponding to a physical diameter of 400-640 AU, assuming a distance of 4 kpc. However, we find that IRAS 05341+0852 is not spatially resolved with this instrumentation. The physical extent of these protoplanetary nebulae, along with the reanalyzed data of IRAS 22272+5435 published previously, suggests a correlation between the physical extent of the hydrocarbon dust emission and the spectral evolution of the aliphatic to aromatic features in these post-AGB stars. These measurements represent the first direct test of the proposed chemical synthesis route of carbonaceous dust in the circumstellar environment of evolved stars. Based on data collected at Subaru Telescope, operated by the National Astronomical Observatory of Japan.
Free Keywords:Stars: Circumstellar Matter; ISM: Dust; Extinction; Infrared: ISM; ISM: Evolution; Stars: AGB and Post-AGB; Stars: Individual: Alphanumeric: IRAS 04296+3429; stars: individual (IRAS 05341+0852); Stars: Individual: Alphanumeric: IRAS 22272+5435
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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