SIMBAD references

2007ApJ...666L..25B - Astrophys. J., 666, L25-L28 (2007/September-1)

Spitzer observations of V4332 Sagittarii: detection of alumina dust.

BANERJEE D.P.K., MISSELT K.A., SU K.Y.L., ASHOK N.M. and SMITH P.S.

Abstract (from CDS):

We present broadband 24, 70, and 160 µm photometry and 5-35 and 55-90 µm spectra of the eruptive variable V4332 Sgr from Spitzer observations. The distinguishing feature of the 5-35 µm spectrum is an unusually broad absorption feature near 10 µm at the position generally associated with silicate-rich dust. Through radiative transfer modeling, we show that this broad feature cannot arise from silicates alone but requires the inclusion of alumina (Al2O3) as a dust condensate. The case for including Al_ 2O3_ is further strengthened by the presence of the AlO radical, a potentially important molecule in forming Al2O3. The present detection indicates that porous alumina manifests itself through a broadening of the 9.7 µm silicate feature and additionally displays, on the shoulder of the silicate feature, a component at ∼11.5 µm. We discuss how further observations of V4332 Sgr may have the potential of verifying some general predictions of the dust condensation process.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - Stars: Novae, Cataclysmic Variables - Stars: Individual: Constellation Name: V4332 Sagittarii

Simbad objects: 4

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2020.09.21-06:17:15

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