期刊
ASTROPHYSICAL JOURNAL
卷 548, 期 2, 页码 861-867出版社
UNIV CHICAGO PRESS
DOI: 10.1086/319035
关键词
circumstellar matter; infrared : stars; stars : individual (alpha Scorpii); stars : late-type
We present the first two-dimensional mid-infrared images of the circumstellar dust distribution around the supergiant star alpha Scorpii. Our observations were made at wavelengths of 12.5 and 20.8 mum using the MIRLIN focal-plane array camera on the Keck II 10 m telescope, with spatial resolution (lambda /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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