Bibcode
García, R. A.; Pérez Hernández, F. ; Régulo, C.; Salabert, D.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 611, id.A84, 19 pp.
Fecha de publicación:
4
2018
Revista
Número de citas
25
Número de citas referidas
21
Descripción
The variations of the frequencies of the low-degree acoustic
oscillations in the Sun induced by magnetic activity show a dependence
on radial order. The frequency shifts are observed to increase towards
higher-order modes to reach a maximum of about 0.8 μHz over the 11-yr
solar cycle. A comparable frequency dependence is also measured in two
other main sequence solar-like stars, the F-star HD 49933, and the young
1 Gyr-old solar analog KIC 10644253, although with different amplitudes
of the shifts of about 2 μHz and 0.5 μHz, respectively. Our
objective here is to extend this analysis to stars with different
masses, metallicities, and evolutionary stages. From an initial set of
87 Kepler solar-like oscillating stars with known individual p-mode
frequencies, we identify five stars showing frequency shifts that can be
considered reliable using selection criteria based on Monte Carlo
simulations and on the photospheric magnetic activity proxy
Sph. The frequency dependence of the frequency shifts of four
of these stars could be measured for the l = 0 and l = 1 modes
individually. Given the quality of the data, the results could indicate
that a physical source of perturbation different from that in the Sun is
dominating in this sample of solar-like stars.
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Savita
Mathur