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Projeto Observacional para 2016B - SO2016B-003
Autor: Augusto Damineli Neto
Título: The undisturbed spectrum of etaCarA reflected on the Key Hole Nebula
Resumo: We plan to record the undisturbed spectrum of the primary star in eta Carinae (etaCarA), as oposed to the spectrum we record directly on the star, which has the secondary star to our side. The secondary star impacts etaCarA by ionization/excitation and leaving a "fossil wind" flowing toward us for the entire period (5.54-yr). Even with HST we were never able to get a clean spectrum of the primary star. Th Key Hole nebula, at NW of eta Carinae, behind eta Carinae, reflects its spectrum, but just H-alfa was recorded in some poitnts up to now. We plan to use Goodman/SOAR longslit to record the entire optical spectrum with 3 goals: a) to model the undisturbed spectrum to derive the stellar parameters; b) to study the latitude dependent spectrum of the fast rotating etaCarA; c) to search for possible light echoes of periastron passages of the secondary star to the back of the primary.