The 10 μm feature of M-type stars in the large magellanic cloud and the dust condensation sequence

C. Dijkstra, A. K. Speck, R. B. Reid, P. Abraham

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

We present 7-14 μm Infrared Space Observatory (ISO) spectroscopy of 12 M-type evolved stars in the Large Magellanic Cloud (LMC), in order to study the dust mineralogy and condensation process around these stars. The sample stars show a broad dust feature in the 7-14 μm region, which is seen in either emission or (self-) absorption. The shape of the feature changes with increasing mass-loss rate, Ṁ, suggesting a change in dust mineralogy as the central star evolves. At low mass-loss rates amorphous alumina and amorphous silicates are observed, while at high mass-loss rates only amorphous silicates are seen, in agreement with the classical condensation sequence expected for these materials. We find a clear correlation between M and the peak wavelength position of the broad dust feature. Our data suggest a strong dependence of the dust mineralogy on the temperature at the dust condensation radius.

Original languageEnglish
Pages (from-to)L133-L136
JournalAstrophysical Journal
Volume633
Issue number2 II
DOIs
Publication statusPublished - Nov 10 2005

Keywords

  • Circumstellar matter
  • Infrared: stars
  • Stars: AGB and post-AGB
  • Stars: late-type
  • Stars: mass loss
  • Stars: winds, outflows

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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