10 AU scale halo structure around DG Tauri

Wen Ping Chen, R. R. Howell, M. Simon, J. A. Benson

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Lunar occultation observations of the active T Tauri star DG Tau show that in the infrared K band it has a core-halo structure: 20%-25% of the flux comes from a region 10 AU in extent and the rest from an unresolved core smaller than an AU. These results are consistent with those reported by Leinert et al. from a separate observation. Our results and those of Leinert et al., measuring the intensity distribution projected along directions spanning roughly 40°, indicate that the resolved structure is not highly elongated. We interpret the extended emission as star light scattered by optically thin dust located in a halo surrounding the star. The total mass of the dust in the halo is only a very small fraction of that in the optically thick disk but is sufficient to produce the silicate absorption and polarization observed in this star.

Original languageEnglish
Pages (from-to)L43-L46
JournalAstrophysical Journal
Issue number1 PART 2
StatePublished - 1 Mar 1992


  • Accretion, accretion disks
  • Circumstellar matter
  • Occultations
  • Stars: individual (DG Tauri)
  • Stars: pre-main-sequence


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