Spectroscopic variabilities in lambda Pavonis

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dc.contributor.author Levenhagen, Ronaldo Savarino [UNIFESP]
dc.contributor.author Leister, N. V.
dc.contributor.author Kuenzel, R.
dc.date.accessioned 2016-01-24T14:17:07Z
dc.date.available 2016-01-24T14:17:07Z
dc.date.issued 2011-09-01
dc.identifier http://dx.doi.org/10.1051/0004-6361/201116590
dc.identifier.citation Astronomy & Astrophysics. Les Ulis Cedex A: Edp Sciences S A, v. 533, 8 p., 2011.
dc.identifier.issn 0004-6361
dc.identifier.uri http://repositorio.unifesp.br/handle/11600/33976
dc.description.abstract Aims. We investigate the time-varying patterns in line profiles, V/R, and radial velocity of the Be star HD 173948 (lambda Pavonis).Methods. Time series analyses of radial velocity, V/R, and line profiles of He I, Fe II, and Si II were performed with the Cleanest algorithm. An estimate of the stellar rotation frequency was derived from the stellar mass and radius in the Roche limit by adopting an aspect angle i derived from the fittings of non-LTE model spectra affected by rotation. the projected rotation velocity, necessary as input for the spectral synthesis procedure, was evaluated from the Fourier transform of the rotation profiles of all neutral helium lines in the optical range.Results. Emission episodes in Balmer and He i lines, as well as V/R cyclic variations, are reported for spectra observed in year 1999, followed by a relatively quiescent phase (2000) and then again a new active epoch (2001). From time series analyses of line profiles, radial velocities, and V/R ratios, four signals with high confidence levels are detected: nu(1) = 0.17 +/- 0.02, nu(2) = 0.49 +/- 0.05, nu(3) = 0.82 +/- 0.03, and nu(4) = 1.63 +/- 0.04 c/d. We interpret nu 4 as a non-radial pulsation g-mode, nu 3 as a signal related to the orbital timescale of ejected material, which is near the theoretical rotation frequency 0.81 c/d inferred from the fitting of the models taken into account for gravity darkening. the signals nu(1) and nu(2) are viewed as aliases of nu(3) and nu(4). en
dc.description.sponsorship Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorship Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent 8
dc.language.iso eng
dc.publisher Edp Sciences S A
dc.relation.ispartof Astronomy & Astrophysics
dc.rights Acesso aberto
dc.subject stars: oscillations en
dc.subject stars: fundamental parameters en
dc.subject stars: emission-line, Be en
dc.subject stars: individual: lambda Pavonis en
dc.title Spectroscopic variabilities in lambda Pavonis en
dc.type Artigo
dc.contributor.institution Universidade Federal de São Paulo (UNIFESP)
dc.contributor.institution Universidade de São Paulo (USP)
dc.description.affiliation Universidade Federal de São Paulo, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, Brazil
dc.description.affiliation Univ São Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 São Paulo, Brazil
dc.description.affiliation Univ São Paulo, Inst Fis, BR-05508900 São Paulo, Brazil
dc.description.affiliationUnifesp Universidade Federal de São Paulo, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, Brazil
dc.description.sponsorshipID FAPESP: 04/14256-8
dc.description.sponsorshipID FAPESP: 2010/06814-4
dc.description.sponsorshipID CNPq: 307095/2008-8
dc.description.sponsorshipID CNPq: 1998/10138-8
dc.identifier.doi 10.1051/0004-6361/201116590
dc.description.source Web of Science
dc.identifier.wos WOS:000295168100075



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