2011A&A...530A.127S


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.19CET23:04:30

2011A&A...530A.127S - Astronomy and Astrophysics, volume 530A, 127-127 (2011/6-1)

About the p-mode frequency shifts in HD 49933.

SALABERT D., REGULO C., BALLOT J., GARCIA R.A. and MATHUR S.

Abstract (from CDS):

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 1450µHz and 2500µHz. 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 2µHz around 2100µHz. 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.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: solar-type - stars: activity - methods: data analysis

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * iot Hor PM* 02 42 33.4664838826 -50 48 01.056222150   5.97 5.40     F8V 333 1
2 HD 49933 ** 06 50 49.831 -00 32 27.18           F3V 321 1

    Equat.    Gal    SGal    Ecl

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2019.11.19-23:04:30

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