Spinning up the Surface: Evidence for Planetary Engulfment or Unexpected Angular Momentum Transport?

Autor: Jamie Tayar, Facundo D. Moyano, Melinda Soares-Furtado, Ana Escorza, Meridith Joyce, Sarah L. Martell, Rafael A. García, Sylvain N. Breton, Stéphane Mathis, Savita Mathur, Vincent Delsanti, Sven Kiefer, Sabine Reffert, Dominic M. Bowman, Timothy Van Reeth, Shreeya Shetye, Charlotte Gehan, Samuel K. Grunblatt

Publikováno v: The Astrophysical Journal, Vol 940, Iss 1, p 23 (2022)

In this paper, we report the potential detection of a nonmonotonic radial rotation profile in a low-mass lower-luminosity giant star. For most low- and intermediate-mass stars, the rotation on the main sequence seems to be close to rigid. As these st

Externí odkaz: https://doaj.org/article/6001f52a1aa9479f86e2d63223f3da31

A homogeneous spectroscopic analysis of a Kepler legacy sample of dwarfs for gravity-mode asteroseismology

Autor: Gang Li, Joey S. G. Mombarg, Peter De Cat, Patricia Lampens, Andrew Tkachenko, M. G. Pedersen, Timothy Van Reeth, J. Bodensteiner, Ilya Straumit, Hans-Walter Rix, Conny Aerts, L. Vermeylen, Ana Escorza, Dominic M. Bowman, Sarah Gebruers

Publikováno v: Gebruers, S, Straumit, I, Tkachenko, A, Mombarg, J S G, Pedersen, M G, Van Reeth, T, Li, G, Lampens, P, Escorza, A, Bowman, D M, De Cat, P, Vermeylen, L, Bodensteiner, J, Rix, H W & Aerts, C 2021, ' A homogeneous spectroscopic analysis of a Kepler legacy sample of dwarfs for gravity-mode asteroseismology ', Astronomy and Astrophysics, vol. 650, A151 . https://doi.org/10.1051/0004-6361/202140466
Astronomy & Astrophysics, 650, pp. 1-27
Astronomy & Astrophysics, 650, 1-27
Astronomy & Astrophysics

Asteroseismic modelling of the internal structure of main-sequence stars born with a convective core has so far been based on homogeneous analyses of space photometric Kepler light curves of 4 years duration, to which most often incomplete inhomogene

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1fcc8a25c181ae26a4552256384fec4d
https://doi.org/10.1051/0004-6361/202140466

Analysis of high-resolution FEROS spectroscopy for a sample of variable B-type stars assembled from TESS photometry

Autor: Sarah Gebruers, Andrew Tkachenko, Dominic M. Bowman, Timothy Van Reeth, Siemen Burssens, Luc IJspeert, Laurent Mahy, Ilya Straumit, Maosheng Xiang, Hans-Walter Rix, Conny Aerts

Publikováno v: Astronomy & Astrophysics, 665, 1-17
Astronomy & Astrophysics, 665, pp. 1-17

Spectroscopic data are necessary to break degeneracies in asteroseismic modelling of the interior structure in high- and intermediate-mass stars. We derive precise photospheric stellar parameters for a sample of 166 B-type stars with TESS light curve

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::86d799c462fdfeaea018aeb9e469012e

Asteroseismic inference of the near-core magnetic field strength in the main sequence B star HD 43317

Autor: Daniel Lecoanet, Timothy Van Reeth, Dominic Bowman

About 10 per cent of intermediate- and high-mass dwarf stars are observed to host a strong large-scale magnetic field at their surface, which is thought to be of fossil field origin. However, there are few inferences as to the magnetic field strength

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b0e663ad8f15f07dcd52c6d81f855d93

Rotation of the convective core in gamma Dor stars measured by dips in period spacings of g modes coupled with inertial modes

Autor: Masao Takata, Timothy Van Reeth, Hideyuki Saio, Umin Lee, Gang Li

The relation of period spacing ($\Delta P$) versus period ($P$) of dipole prograde g modes is known to be useful to measure rotation rates in the g-mode cavity of rapidly rotating $\gamma$ Dor and slowly pulsating B (SPB) stars. In a rapidly rotating

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5bf24a0df1863346605bcc22a5b486e3
https://lirias.kuleuven.be/handle/123456789/675367