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Astron. Astrophys. 326, 271-276 (1997)

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5. Conclusions

  1. The light variations of UX Ori show prominent Algol-like minima, which are caused by circumstellar dust clouds orbiting the star.
  2. The IRAS data reveals an infrared dust emission originating from thermalized stellar radiation.
  3. We performed radiative transfer calculations to derive the physical parameters of the circumstellar dust shell and found that the density varies as [FORMULA] in good agreement with the distributions in the circumstellar shells of other Herbig Ae/Be stars.
  4. Comparing the profile of the 10 µ m silicate band with laboratory data for glassy Mg-Fe pyroxene and olivine indicates that the silicate consists of pyroxene or a mixture of pyroxene and olivine and the grains have diameters of about 0.75 to 1 µ m.
  5. The grain sizes needed to explain the observed profile fit nicely with other observations indicating that circumstellar grains are larger than the interstellar ones.
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© European Southern Observatory (ESO) 1997

Online publication: April 20, 1998