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Astron. Astrophys. 335, 979-984 (1998)


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Polarimetry and spectroscopy of the polar RX J1141.3-6410 *

C.V. Rodrigues 1, 2, D. Cieslinski 2, 1 and J.E. Steiner 2, 3

1 Div. Astrofísica, Instituto Nacional de Pesquisas Espaciais/MCT, Caixa Postal 515, 12201-970, São José dos Campos, SP, Brazil
2 Departamento de Astronomia, Instituto Astronômico e Geofísico/USP, Caixa Postal 9638, 01065-970 São Paulo, SP, Brazil
3 Laboratório Nacional de Astrofísica/CNPq/MCT, Av. Estados Unidos, 154, 37500-000 Itajubá, MG, Brazil

Received 12 September 1997 / Accepted 21 April 1998

Abstract

We present the first optical polarimetric measurements of RX J1141.3-6410 which confirm that star as a polar. The circular polarization varies between 0 and 13% with the orbital period. H[FORMULA] spectroscopy shows that this line is formed by, at least, two components: a broad and a narrow one. The phase of maximum redshift of the broad component is shifted by 0.5 with the phase of maximum circular polarization which is not usual for this class of stars. We suggest a geometrical configuration for the system which could explain the main features of the polarimetric and spectroscopic data.

Key words: stars: individual: RX J1141.3-6410 – stars: novae, cataclysmic variables – stars: magnetic fields – accretion, accretion disks – polarization – X-rays: stars

* This work was based on observations made at Laboratório Nacional de Astrofísica/CNPq/MCT, Brazil.

Send offprint requests to: C. V. Rodrigues, (claudia@das.inpe.br)

© European Southern Observatory (ESO) 1998

Online publication: June 26, 1998

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