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Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope

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Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope

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Título Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope
Autor Kurtz, Donald W.
Kawaler, Steven D.
Riddle, Reed L.
Reed, M. D.
Cunha, Margarida S.
Wood, Matthew A.
Silvestri, Nicole M.
Watson, Todd K.
Dolez, Noël
Moskalik, Pawel
Zola, Staszek
Pallier, E.
Guzik, Joyce Ann
Metcalfe, Travis S.
Mukadam, Anjum Shagufta
Nather, R. Edward
Winget, Donald Earl
Sullivan, Denis J.
Sullivan, Terry
Sekiguchi, Kazuhiro
Jiang, Xiaojun
Shobbrook, Robert R.
Ashoka, B.N.
Seetha, S.
Joshi, Santosh
O'Donoghue, Darragh
Handler, Gerald
Mueller, M.
Gonzalez Perez, Jose Miguel
Solheim, Jan-Eric
Johannessen, F.
Ulla, Ana
Kepler, Souza Oliveira
Kanaan Neto, Antonio Nemer
Costa, Alex Fabiano Murillo da
Fraga, Luciano
Giovannini Junior, Odilon
Matthews, Jaymie M.
WET collaboration
Abstract HR1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of non-radial stellar pulsation. Prior observations showed a clear pattern of five modes with alternating frequency spacings of 33.3 and 34.6 μmHz, with a sixth mode at a problematic spacing of 50.0 μHz (which equals 1.5 x 33.3 μHz†) to the high-frequency side. Asymptotic pulsation theory allowed for a frequency spacing of 34 μHz, but Hipparcos observations rule out such a spacing. Theoretical calculations of magnetoacoustic modes in Ap stars by Cunha predicted that there should be a previously undetected mode 34 μHz higher than the main group, with a smaller spacing between it and the highest one. In this Letter, we present preliminary results from a multisite photometric campaign on the rapidly oscillating Ap star HR1217 using the ‘Whole Earth Telescope’. While a complete analysis of the data will appear in a later paper, one outstanding result from this run is the discovery of a newly detected frequency in the pulsation spectrum of this star, at the frequency predicted by Cunha.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 330, no. 3 (Mar. 2002), p. L57-L61
Assunto Estrelas magneticas
Estrelas variaveis
Fotometria estelar
Pulsacoes estelares
[en] Stars: individual: HR1217
[en] Stars: magnetic fields
[en] Stars: oscillations
[en] Stars: variables: other
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/89995
Arquivos Descrição Formato
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