Oscillations of red giant stars with magnetic damping in the core - I. Dissipation of mode energy in dipole-like magnetic fields

Home

All issues

Volume 696 (April 2025)

A&A, 696 (2025) A134

Full HTML

Open Access

Table 3.

Average frequency shifts of the dipole modes caused by different internal magnetic field configurations for three stellar models.

M_*/M_⊙	Z_init	ν_max/μHz	B_crit, cen/MG	B_crit, H/MG	${(\frac{δ ω_{0}}{2 π})}_{PG, H} / μ$ $\left(\frac{\delta\omega_0}{2\pi}\right)_{\mathrm{PG,H}}/{\upmu}$ Hz	${(\frac{δ ω_{0}}{2 π})}_{PG, core} / μ$ $\left(\frac{\delta\omega_0}{2\pi}\right)_{\mathrm{PG,core}}/{\upmu}$ Hz	${(\frac{δ ω_{0}}{2 π})}_{pla} / μ$ $\left(\frac{\delta\omega_0}{2\pi}\right)_{\mathrm{pla}}/{\upmu}$ Hz
1	0.02	127.03	8.78	0.39	1.33 (2.65)	1.40 (2.80)	2.09 (4.18)
1	0.005	129.53	8.87	0.47	1.36 (2.72)	1.40 (2.81)	2.38 (4.75)
1.3	0.02	127.99	8.90	0.35	1.34 (2.69)	1.36 (2.71)	2.06 (4.13)

Notes. The models were selected from each evolutionary track to mimic the observed value of ν_max of KIC 6975038 (e.g., Deheuvels et al. 2023). The magnetic field strengths have been chosen such that the suppression of the multipole modes behaves as shown in Fig. 7. The average frequency shifts have been determined using the first-order perturbation approach of Li et al. (2022). Note that the application of this method to magnetic field strengths close to the critical field strength is expected to lead to an underestimation of the frequency shifts (Rui et al. 2024). The quantity (δω₀/2π)_PG, H corresponds to the frequency shift induced by a Prendergast field that is contained by the region at and within the hydrogen-burning shell, while (δω₀/2π)_PG, core corresponds to a Prendergast field that extends over the entire radiative core. (δω₀/2π)_pla corresponds to the frequency shift induced by the improvised field with a plateau within the hydrogen-burning shell introduced in Sect. 3.3. The value of the average frequency shifts without brackets (in brackets) corresponds to the azimuthal order m = 0 (m = ±1).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.