Sub-arcsecond imaging and spectroscopic observations of the Red Rectangle in the N-band

Details Sub-arcsecond imaging and spectroscopic observations of the Red Rectangle in the N-band Sub-arcsecond imaging and spectroscopic observations of the Red Rectangle in the N-band

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...415..179m&link_type=abstract

Astronomy and Astrophysics, v.415, p.179-187 (2004)

Astronomy and Astrophysics

Astrophysics

18

Circumstellar Matter, Stars: Individual: Red Rectangle, Stars: Agb And Post-Agb, Infrared: Stars

Scientific paper

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 arcsec, which corresponds to 60 AU. The core spectrum is well modeled by blackbody emission with a temperature of 358 K. 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 8.6 μm and 11.2 μm are prominently observed. At radii >1 arcsec 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 11.27 μm is seen at a distance of 0.3 arcsec on all sides of the nebula. We attribute this to crystalline silicate olivine grains around the central torus.

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