About the p-mode frequency shifts in HD 49933

We study the frequency dependence of the frequency shifts of the low-degree p modes measured in the F5V star HD 49933, by analyzing the second run of observations collected by the CoRoT satellite. The 137-day light curve is divided into two subseries corresponding to periods of low and high stellar activity. The activity-frequency relationship is obtained independently from the analysis of the mode frequencies extracted by both a local and a global peak-fitting analyses, and from a cross-correlation technique in the frequency range between 1450 μHz and 2500 μHz. The three methods return consistent results. We show that the frequency shifts measured in HD 49933 present a frequency dependence with a clear increase with frequency, reaching a maximal shift of about 2 μHz around 2100 μHz. Similar variations are obtained between the l = 0 and l = 1 modes. At higher frequencies, the frequency shifts show indications of a downturn followed by an upturn, consistent between the l = 0 and 1 modes. We show that the frequency variation of the p-mode frequency shifts of the solar-like oscillating star HD 49933 has a comparable shape to the one observed in the Sun, which is understood to arise from changes in the outer layers due to its magnetic activity.

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An edited version of this paper was published by EDP Sciences. Copyright 2011 European Southern Observatory.


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Author Salabert, D.
Régulo, C.
Ballot, J.
Garcia, R.
Mathur, Savita
Publisher UCAR/NCAR - Library
Publication Date 2011-06-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:08:40.943646
Metadata Record Identifier edu.ucar.opensky::articles:10823
Metadata Language eng; USA
Suggested Citation Salabert, D., Régulo, C., Ballot, J., Garcia, R., Mathur, Savita. (2011). About the p-mode frequency shifts in HD 49933. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7dz08v1. Accessed 28 March 2024.

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