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The nature of p-modes and granulation in HD 49933 | | T. Kallinger
; M. Gruberbauer
; D. B. Guenther
; L. Fossati
; W. W. Weiss
; | | Date: |
28 Nov 2008 | | Abstract: | Context. Oscillations on the Procyon-like star HD 49933 (F5V) were obtained
recently by CoRoT. A full reduction and analysis of the data by the CoRoT team
yielded a detailed spectrum of l = 0, 1, and 2 p-modes. Aims. To provide our
own independent reductions and stellar modeling of the CoRoT oscillation data
for HD 49933. Methods. We used a new Bayesian Markov Chain Monte Carlo method
to fit Lorentzian mode profiles to the observed power density spectrum to
obtain a list of frequencies. We then searched several dense and extensive
grids of stellar model oscillation spectra for models whose oscillation spectra
best matches the derived frequencies. We quantified the statistical probability
of the best model fits using a Bayesian approach. Results. We identify 24
frequencies. In contrast to the original CoRoT analysis we find no
statistically significant evidence for l = 2 (or 3) modes. Our best fit model
has solar composition and lies within the error box of the observationally
derived HR-diagram location for HD 49933. We also show that lower Z models have
a lower probability of matching the observations and we discuss new
spectroscopic evidence for a solar metallicity of HD 49933. | | Source: | arXiv, 0811.4686 | | Services: | Forum | Review | PDF | Favorites | |
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