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Discovery of a Reflection Dust Envelope Around IRC+10216

  • M. Tamura (a1), T. Hasegawa (a2), N. Ukita (a2), I. Gatley (a3), I. S. McLean (a3), M. G. Burton (a3), J. T. Rayner (a4) and M. J. McCaughrean (a4)...

Extract

Infared polarimetric and photometric mapping observations at K(2.2 μm) and H(1.65 μm) have revealed an extended dust envelope around the late-type star IRC+10216. The observations were made on the 3.8-m United Kingdom Infrared Telescope on Mauna Kea, Hawaii, in 1985 December and 1987 January and February. The polarization observations were made by emplying the Kyoto polarimeter (Sato et al. 1987). Great care was taken to check the contamination by stray light in the telescope and instruments as the source on peak was extremely bright (K~0 mag). From the observations of normal stars, we found that the polarized intensity (degree of polarization times the intensity) was a good measure of the envelope, free from contamination by stray light, although the intensity and the degree of polarization suffered from the contamination separately.

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Copyright

References

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Bieging, J.H., Chapman, B., and Welch, W.J. 1984, Ap. J., 285, 656
Sato, S. et al. 1987, M.N.R.A.S., in press.
Wannier, P.G., Leighton, R.B., Knapp, G.R., Redman, R.O., Phillips, T.G., and Huggins, P.J. 1979, Ap. J., 230, 149
Wilson, W.J., Schwartz, P.R., and Epstein, E.E. 1973, Ap. J., 183, 871
Wootten, A., Lichten, S.M., Sahai, R., and Wannier, P.G. 1982, Ap. J., 257, 151.

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