2009A&A...508.1337P


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.21CEST08:34:13

2009A&A...508.1337P - Astronomy and Astrophysics, volume 508, 1337-1341 (2009/12-4)

Hα spectropolarimetry of the B[e] supergiant GG Carinae.

PEREYRA A., DE ARAUJO F.X., MAGALHAES A.M., BORGES FERNANDES M. and DOMICIANO DE SOUZA A.

Abstract (from CDS):

We study the geometry of the circumstellar environment of the B[e] supergiant star GG Car. We present observations acquired using the IAGPOL imaging polarimeter in combination with the Eucalyptus-IFU spectrograph to obtain spectropolarimetric measurements of GG Car across Hα at two epochs. Polarization effects along the emission line are analysed using the Q-U diagram. In particular, the polarization position angle (PA) obtained using the line effect is able to constrain the symmetry axis of the disk/envelope. By analysing the fluxes, GG Car shows an increase in its double-peaked Hα line emission relative to the continuum within the interval of our measurements (∼43-days). 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.

Abstract Copyright:

Journal keyword(s): polarization - stars: individual: GG Car - circumstellar matter

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 34664 s*b 05 13 52.9943883589 -67 26 54.822130587 11.509 11.88 11.774 11.63 10.991 B0/0.5I[e] 94 0
2 HD 45677 Be* 06 28 17.4219761127 -13 03 11.130589443 7.86 8.52 8.50 8.11 8.01 B2IV/V[e] 307 0
3 HD 94878 EB* 10 55 58.9150038252 -60 23 33.434805592 8.67 9.37 8.70 8.07   B0/2eq 142 0

    Equat.    Gal    SGal    Ecl

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2021.04.21-08:34:13

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