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Astron. Astrophys. 334, 969-975 (1998)


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2D Speckle polarimetry of Z Canis Majoris

O. Fischer 1, B. Stecklum 2 and Ch. Leinert 3

1 Astrophysikalisches Institut und Universitäts-Sternwarte, Schillergässchen 2, D-07745 Jena, Germany
2 Thüringer Landessternwarte, Sternwarte 5, D-07778 Tautenburg, Germany
3 Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany

Received 5 January 1998 / Accepted 6 March 1998

Abstract

We present the first high angular resolution polarization measurements of the pre-main sequence binary system Z CMa at [FORMULA] m. Both binary components are polarized. The polarization of the infrared primary ([FORMULA], [FORMULA]) is near to that of the total system and is likely connected to the `outflow configuration'. The secondary shows an unexpected large polarization degree ([FORMULA]) at the position angle ([FORMULA]) different to that of the primary. This high polarization can be explained by a circumstellar accretion disk seen more pole-on than edge-on. The results are discussed with respect to the formation mechanisms of young binary stars.

Key words: polarization – methods: statistical – techniques: interferometric – binaries: close – stars: pre-main sequence – infrared: stars

Send offprint requests to: O. Fischer

© European Southern Observatory (ESO) 1998

Online publication: June 2, 1998

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