Mid-Infrared Images of the Circumstellar Dust around α Scorpii

Details Mid-Infrared Images of the Circumstellar Dust around α Scorpii Mid-Infrared Images of the Circumstellar Dust around α Scorpii

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...548..861m&link_type=abstract

The Astrophysical Journal, Volume 548, Issue 2, pp. 861-867.

Astronomy and Astrophysics

Astronomy

4

Stars: Circumstellar Matter, Infrared: Stars, Stars: Individual: Constellation Name: Α Scorpii, Stars: Late-Type

Scientific paper

We present the first two-dimensional mid-infrared images of the circumstellar dust distribution around the supergiant star α Scorpii. Our observations were made at wavelengths of 12.5 and 20.8 μm using the MIRLIN focal-plane array camera on the Keck II 10 m telescope, with spatial resolution (λ/D) of 0.29" and 0.48" at the two wavelengths, respectively. Our deconvolved images, which provide a resolution enhancement of approximately a factor of 2, show that the dust shell previously detected in one-dimensional scans is actually highly nonuniform. Specifically, the shell is now seen to be concentrated largely into three discrete clumps, and there is evidence of a more recent ejection which has left a central concentration of dust within about 0.3" from the star.

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