Mid-infrared images of the circumstellar dust around α scorpii

K. A. Marsh, E. E. Bloemhof, D. W. Koerner, M. E. Ressler

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)861-867
Number of pages7
JournalAstrophysical Journal
Volume548
Issue number2 PART 1
DOIs
StatePublished - Feb 20 2001

Keywords

  • Circumstellar matter
  • Infrared: stars
  • Stars: individual (α Scorpii)
  • Stars: late-type

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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