2004A&A...415..179M -
Astronomy and Astrophysics, volume 415, 179-187 (2004/2-3)
Sub-arcsecond imaging and spectroscopic observations of the Red Rectangle in the N-band.
MIYATA T., KATAZA H., OKAMOTO Y.K., ONAKA T., SAKO S., HONDA M., YAMASHITA T. and MURAKAWA K.
Abstract (from CDS):
We carried out imaging and long-slit spectroscopic observations of the Red Rectangle in the N-band using the 8.2-m SUBARU telescope. The resulting images reveal a central bright core and an extended nebula. The central core is slightly extended in the N-band. The core radius is estimated to be ∼0.09'', which corresponds to 60AU. The core spectrum is well modeled by blackbody emission with a temperature of 358K. The estimated size and temperature are in good agreement with the predictions of recent dusty torus models. In the north/south nebula, unidentified infrared (UIR) emission features at 8.6µm and 11.2µm are prominently observed. At radii >1'' they completely dominate the N-band spectra, suggesting that the nebula seen at N-band wavelengths is primarily brightened by the UIR-band emission, not by scattered light. We also detected shifts in the UIR-feature peaks with increasing distance from the center. These may be attributed to isotopic shifts due to the presence of 13C in polycyclic aromatic hydrocarbons (PAH) like particles. In addition to the UIR emission, a broad feature at 11.27µm is seen at a distance of 0.3'' on all sides of the nebula. We attribute this to crystalline silicate olivine grains around the central torus.
Abstract Copyright:
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Journal keyword(s):
circumstellar matter - stars: individual: Red Rectangle - stars: AGB and post-AGB - infrared: stars
Simbad objects:
1
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