Variable Dust Features in Infrared Spectra of AU Cygni

Details Variable Dust Features in Infrared Spectra of AU Cygni Variable Dust Features in Infrared Spectra of AU Cygni

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...467..806l&link_type=abstract

Astrophysical Journal v.467, p.806

Astronomy and Astrophysics

Astronomy

15

Stars: Circumstellar Matter, Stars: Individual Constellation Name: Au Cygni, Ism: Dust, Extinction, Infrared: Stars

Scientific paper

We report the first clear evidence for variation in the infrared spectral features due to silicates in the circumstellar shell of the oxygen-rich Mira variable AU Cygni, based on individual scans obtained with the IRAS low-resolution spectrometer, during the 1983 IRAS mission. For the optically thin shell of AU Cyg, the contrast of the silicate feature is stronger near optical maximum and weaker near optical minimum. We propose that circumstellar dust has a significant population of small grains. This population may get enhanced near maximum, probably due to evaporation of larger grains, increasing the amount of 10 μm band emission relative to continuum emission. The shape of the emission feature does not vary measurably from maximum to minimum brightness.

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