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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

H alpha spectropolarimetry of the B[e] supergiant GG Carinae

Texto completo
Autor(es):
Pereyra, A. [1] ; de Araujo, F. X. [1] ; Magalhaes, A. M. [2] ; Fernandes, M. Borges [3] ; de Souza, A. Domiciano [3]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Observ Nacl, BR-20921400 Rio De Janeiro - Brazil
[2] Univ Sao Paulo, IAG, Dept Astron, BR-05508900 Sao Paulo - Brazil
[3] Univ Nice Sophia Antipolis, CNRS, Observ Cote Azur, H Fizeau UMR 6525, Nice - France
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 508, n. 3, p. 1337-1341, DEC 2009.
Citações Web of Science: 9
Resumo

Aims. We study the geometry of the circumstellar environment of the B{[}e] supergiant star GG Car. Methods. We present observations acquired using the IAGPOL imaging polarimeter in combination with the Eucalyptus-IFU spectrograph to obtain spectropolarimetric measurements of GG Car across Ha 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. Results. By analysing the fluxes, GG Car shows an increase in its double-peaked Ha line emission relative to the continuum within the interval of our measurements (similar to 43 days). The depolarization line effect around Ha 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 Ha is also observed, indicating a counter-clockwise rotating disk. The intrinsic PA calculated using the line effect (similar to 85 degrees.) is consistent between our two epochs, suggesting a clearly defined symmetry axis of the disk. (AU)

Processo FAPESP: 02/12880-0 - Poeira e campos magnéticos interestelares
Beneficiário:Antonio Armstrong Pereyra Quirós
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 01/12589-1 - Stars, the interstellar medium and their interrelationships
Beneficiário:Antônio Mário Magalhães
Linha de fomento: Auxílio à Pesquisa - Temático