NOAO >   Observing Info >   Approved Programs >   2015A-0002

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Proposal Information for 2015A-0002


PI: Tahina Ramiaramanantsoa, Universite de Montreal, tahina@astro.umontreal.ca
Address: Department de Physique, C.P. 6128, Succ. Centre-Ville, Montr\a'{e}al, Qu\a'{e}bec H3C 3J7, CANADA

CoI: Anthony Moffat, Universite de Montreal
CoI: Noel Richardson, Universite de Montreal
CoI: Thomas Eversberg, Schnorringen Telescope Science Institute
CoI: Bernard Heathcote, Barfold Observatory
CoI: Andre-Nicolas Chene, Gemini Observatory
CoI: Wayne Waldron, Eureka Scientific
CoI: Brent Miszalski, South African Astronomical Observatory

Title: Probing the photospheric origin of large scale wind structures in the hot supergiant \zeta Puppis

Abstract: We propose spectroscopic monitoring of the HeII (lambda)4686Aand H(alpha) lines in the hot supergiant \zeta Puppis (O4If(n)p, V=2.25) with the CHIRON echelle spectrograph mounted at the CTIO 1.5 m telescope. These observations will complement spectroscopic monitoring of the same lines with SALT-HRS, SAAO 1.5 m/GIRAFFE and Barfold Observatory and aim at probing the inner stellar wind activity related to the presence of large scale Corotating Interaction Regions (CIRs), which usually manifest themselves in the UV spectra as propagating Discrete Absorption Components (DACs), ubiquitous in O stars. Simultaneous high-precision space-based optical photometry will be provided by the \emphBRITE nanosatellites for up to six contiguous months, probing the photospheric origin of these CIRs and DACs, theoretically suspected to be bright spots. This large campaign on the early-type O star \zeta Pup will constitute a significant step towards establishing and understanding the link between large scale wind structures in hot luminous massive stars and their photospheric origin. This proposal is a continuation of proposal 2014B-0082 in order to examine the variability of the star during the entire \emphBRITE run.


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NOAO >   Observing Info >   Approved Programs >   2015A-0002

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