Mid-infrared images of the circumstellar dust around α scorpii

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

Research output: Contribution to journalArticle

10 Citations (Scopus)

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
Externally publishedYes

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dust
shell
supergiant stars
wavelength
focal plane devices
clumps
ejection
wavelengths
spatial resolution
cameras
telescopes
stars
augmentation
distribution

Keywords

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

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Mid-infrared images of the circumstellar dust around α scorpii. / Marsh, K. A.; Bloemhof, E. E.; Koerner, David W; Ressler, M. E.

In: Astrophysical Journal, Vol. 548, No. 2 PART 1, 20.02.2001, p. 861-867.

Research output: Contribution to journalArticle

Marsh, KA, Bloemhof, EE, Koerner, DW & Ressler, ME 2001, 'Mid-infrared images of the circumstellar dust around α scorpii', Astrophysical Journal, vol. 548, no. 2 PART 1, pp. 861-867. https://doi.org/10.1086/319035
Marsh, K. A. ; Bloemhof, E. E. ; Koerner, David W ; Ressler, M. E. / Mid-infrared images of the circumstellar dust around α scorpii. In: Astrophysical Journal. 2001 ; Vol. 548, No. 2 PART 1. pp. 861-867.
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