2020A&A...638A.149V


Query : 2020A&A...638A.149V

2020A&A...638A.149V - Astronomy and Astrophysics, volume 638A, 149-149 (2020/6-1)

Detecting axisymmetric magnetic fields using gravity modes in intermediate-mass stars.

VAN BEECK J., PRAT V., VAN REETH T., MATHIS S., BOWMAN D.M., NEINER C. and AERTS C.

Abstract (from CDS):


Context. Angular momentum (AM) transport models of stellar interiors require improvements to explain the strong extraction of AM from stellar cores that is observed with asteroseismology. One of the frequently invoked mediators of AM transport are internal magnetic fields, even though their properties, observational signatures, and influence on stellar evolution are largely unknown.
Aims. We study how a fossil, axisymmetric internal magnetic field affects period spacing patterns of dipolar gravity mode oscillations in main sequence stars with masses of 1.3, 2.0, and 3.0M. We assess the influence of fundamental stellar parameters on the magnitude of pulsation mode frequency shifts.
Methods. We computed dipolar gravity mode frequency shifts due to a fossil, axisymmetric poloidal-toroidal internal magnetic field for a grid of stellar evolution models, varying stellar fundamental parameters. Rigid rotation was taken into account using the traditional approximation of rotation, and the influence of the magnetic field was computed using a perturbative approach.
Results. We find magnetic signatures for dipolar gravity mode oscillations in terminal-age main sequence stars that are measurable for a near-core field strength larger than 105G. The predicted signatures differ appreciably from those due to rotation.
Conclusions. Our formalism demonstrates the potential for the future detection and characterization of strong fossil, axisymmetric internal magnetic fields in gravity-mode pulsators near the end of core-hydrogen burning from Kepler photometry, if such fields exist.

Abstract Copyright: © ESO 2020

Journal keyword(s): asteroseismology - waves - stars: magnetic field - stars: oscillations - stars: rotation

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 - 2022
#notes
1 HD 43317 Pu* 06 15 47.0134228488 +04 17 01.095049500 5.82 6.456 6.614     B3IV 102 0
2 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2601 0

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2022.08.15-15:46:19

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