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Hα spectropolarimetry of GG Car

Published online by Cambridge University Press:  12 July 2011

Antonio Pereyra ,
Francisco X. de Araújo ,
Antonio M. Magalhães ,
Marcelo Borges Fernandes  and
Armando Domiciano de Souza
Antonio Pereyra
Affiliation:
Observatório Nacional, Rua General José Cristino 77, São Cristovão, Rio de Janeiro, Brazil
Francisco X. de Araújo
Affiliation:
Observatório Nacional, Rua General José Cristino 77, São Cristovão, Rio de Janeiro, Brazil
Antonio M. Magalhães
Affiliation:
Dept. de Astronomia, IAG, Univ. de São Paulo, Rua do Matão 1226, São Paulo, Brazil
Marcelo Borges Fernandes
Affiliation:
Observatório Nacional, Rua General José Cristino 77, São Cristovão, Rio de Janeiro, Brazil
Armando Domiciano de Souza
Affiliation:
UMR 6525 H. Fizeau, Univ. Nice Sophia Antipolis, CNRS, Obs. de la Côte d'Azur, France
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Abstract

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We present spectropolarimetric observations of the B[e] supergiant star GG Car at two epochs. Polarization line effects along Hα are analysed using the Q–U diagram. In particular, the polarization position angle (PA) obtained using the line effect allows to constrain the symmetry axis of the disk/envelope. The depolarization line effect around Hα is evident in the Q–U diagram for both epochs, confirming that light from the system is intrinsically polarized. A rotation of the PA along Hα is also observed, indicating a counter-clockwise rotating disk. The intrinsic PA calculated using the line effect (~85°) is consistent between our two epochs, suggesting a clearly defined symmetry axis of the disk.

Keywords

polarizationstars: individual (GG Car)circumstellar matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 420 - 421
Copyright
Copyright © International Astronomical Union 2011

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