Backtracing the internal rotation history of the $\beta$ Cep star HD 129929

Abstract

HD 129929 is a slowly-rotating $\beta$ Cephei pulsator with a rich spectrum of detected oscillations, including two rotational multiplets. The asteroseismic interpretation revealed the presence of radial differential rotation in this massive star of $\sim$9.35 M . The stellar core is indeed estimated to spin $\sim$3.6 times faster than the surface. The surface rotation was consequently derived as $\sim$2 km/s. This massive star represents an ideal counter-part to the wealth of space-based photometry results for main-sequence and evolved low-mass stars. Those latter have revealed a new, and often unexpected, picture of the angular momentum transport processes acting in stellar interiors. We investigate in a new way the constraints on the internal rotation of HD 129929, focusing on their interpretation for the evolution of the internal rotation during the main sequence of a massive star. We test separately hydrodynamic and magnetic instability transport processes of angular momentum. We used the best asteroseismic model obtained in an earlier work. We calibrated stellar models including rotation, with different transport processes, to reproduce that reference model. We then looked whether one process is favoured to reproduce the rotation profile of HD 129929, based on the fit of the asteroseismic multiplets. The impact of the Tayler magnetic instability on the angular momentum transport predicts a ratio of the core-to-surface rotation rate of only 1.6, while the recently revised prescription of this mechanism predicts solid-body rotation. Both are too low in comparison with the asteroseismic inference. The models with only hydrodynamic processes are in good agreement with the asteroseismic measurements. Strikingly, we can also get a constraint on the profile of rotation on the zero age main sequence: likely, the ratio between the core and surface rotation was at least $\sim$1.7.

5 pages, 3 figures, accepted for publication as a letter in A&A

References in corpus (21)

• Slowing the Spins of Stellar Cores
• CLES, Code Liegeois d'Evolution Stellaire
• Asteroseismic measurement of surface-to-core rotation in a main sequence A star, KIC 11145123
• The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
• Asteroseismic measurement of slow, nearly-uniform surface-to-core rotation in the main sequence F star KIC 9244992
• An asteroseismic study of the beta Cephei star theta Ophiuchi: constraints on global stellar parameters and core overshooting
• A new asteroseismic diagnostic for internal rotation in $\gamma$ Doradus stars
• The Liege Oscillation Code
• The two hybrid B-type pulsators: Nu Eridani and 12 Lacertae
• Constraining the efficiency of angular momentum transport with asteroseismology of red giants: the effect of stellar mass
• Period spacings of $\gamma$ Doradus pulsators in the \textit{Kepler} field: Rossby and gravity modes in 82 stars
• Rotation of the convective core in $\gamma$ Dor stars measured by dips in period spacings of g modes coupled with inertial modes
• Seismic evidence for near solid-body rotation in two Kepler subgiants and implications for angular momentum transport
• An asteroseismic study of the beta Cephei star beta Canis Majoris
• Rotation rate of the solar core as a key constraint to magnetic angular momentum transport in stellar interiors
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum. I. Efficiency of transport during the subgiant phase
• delta Ceti is not monoperiodic: seismic modeling of a beta Cephei star from MOST spacebased photometry
• Stellar models and isochrones from low-mass to massive stars including pre-main sequence phase with accretion
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum. IV. Internal rotation of Kepler 56 from an MCMC analysis of the rotational splittings
• Asteroseismology of $\beta$ Cephei stars: The stellar inferences tested in hare and hound exercises
• Constraining the near-core rotation of the gamma Doradus star 43 Cygni using BRITE-Constellation data

Cited by in corpus (6)

• Angular momentum transport by magnetic fields in main sequence stars with Gamma Doradus pulsators
• The Asteroseismic Imprints of Mass Transfer: A Case Study of a Binary Mass Gainer in the SPB Instability Strip
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum. VI. Testing a parametric formulation for the azimuthal magneto-rotational instability
• Interior rotation modelling of the $\beta$ Cep pulsator HD 192575 including multiplet asymmetries
• Chemical evolution of close massive binaries -- tidally-enhanced or tidally-suppressed mixing?
• Impact of the Tayler magnetic instability on the surface abundance of boron in massive stars