Abstract
The moment method is a well known technique, which uses a time series of the first 3 moments of a spectral line, to estimate the (discrete) mode parameters l and m. The method, contrary to Doppler imaging, also yields other interesting (real-valued) parameters such as the inclination angle i, or v sin i, during its identification procedure. In this paper, we are not only interested in the estimation of these real-valued parameters themselves but also in reliable estimates for their uncertainty. We designed a statistical formalism for the moment method based on the so-called generalized estimating equations (GEE). This formalism aims to estimate the uncertainty of the real-valued parameters taking into account that the different moments of a line profile are correlated and — more importantly — that the uncertainty of the observed moments depends on the pulsation parameters. The latter property of the moment method makes the least-squares technique a poor choice to estimate the uncertainty of the real-valued parameters. We implemented the GEE method and present an application to a high-resolution spectroscopic dataset of the slowly pulsating B star HD181558.
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References
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© 2003 Springer Science+Business Media Dordrecht
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de Ridder, J., Molenberghs, G., Aerts, C. (2003). Statistical Revision of the Moment Method. In: Thompson, M.J., Cunha, M.S., Monteiro, M.J.P.F.G. (eds) Asteroseismology Across the HR Diagram. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0799-2_17
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DOI: https://doi.org/10.1007/978-94-017-0799-2_17
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-6241-3
Online ISBN: 978-94-017-0799-2
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