Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Hartogh, J. W. den"'
Publikováno v:
2022, A&A 664, L16
Context: Asteroseismic measurements of the internal rotation of evolved stars indicate that at least one unknown efficient angular momentum (AM) transport mechanism is needed in stellar radiative zones. Aims: We investigate the impact of AM transport
Externí odkaz:
http://arxiv.org/abs/2309.17396
Autor:
Hartogh, J. W. den, López, A. Yagüe, Cseh, B., Pignatari, M., Világos, B., Roriz, M. P., Pereira, C. B., Drake, N. A., Junqueira, S., Lugaro, M.
Publikováno v:
A&A 672, A143 (2023)
We aim to analyse the abundance pattern of 169 Barium (Ba) stars, using machine learning techniques and the AGB final surface abundances predicted by Fruity and Monash stellar models. We developed machine learning algorithms that use the abundance pa
Externí odkaz:
http://arxiv.org/abs/2212.03593
Autor:
López, A. Yagüe, García-Hernández, D. A., Ventura, P., Doherty, C. L., Hartogh, J. W. den, Jones, S. W., Lugaro, M.
Publikováno v:
A&A 657, A28 (2022)
Aims. We describe the first s-process post-processing models for asymptotic giant branch (AGB) stars of masses 3, 4 and 5 M at solar metallicity (Z=0.018) computed using the input from the stellar evolutionary code aton. Methods. The models are compu
Externí odkaz:
http://arxiv.org/abs/2110.08035
Radioactive nuclei were present in the early Solar System, as inferred from analysis of meteorites. Many are produced in massive stars, either during their lives or their final explosions. In the first paper in this series (Brinkman et al. 2019), we
Externí odkaz:
http://arxiv.org/abs/2109.05842
Publikováno v:
A&A 641, A117 (2020)
Asteroseismic measurements of the internal rotation of subgiants and red giants all show the need for invoking a more efficient transport of angular momentum than theoretically predicted. Constraints on the core rotation rate are available starting f
Externí odkaz:
http://arxiv.org/abs/2007.02585
Publikováno v:
A&A 634, L16 (2020)
Context: The internal characteristics of stars, such as their core rotation rates, are obtained via asteroseismic observations. A comparison of core rotation rates found in this way with core rotation rates as predicted by stellar evolution models de
Externí odkaz:
http://arxiv.org/abs/2002.06566
Autor:
Eggenberger, P., Hartogh, J. W. den, Buldgen, G., Meynet, G., Salmon, S. J. A. J., Deheuvels, S.
Publikováno v:
2019, A&A 631, L6
Context: Asteroseismic measurements reveal that an unknown efficient angular momentum (AM) transport mechanism is needed for subgiant and red giant stars. A revised prescription for AM transport by the magnetic Tayler instability has been recently pr
Externí odkaz:
http://arxiv.org/abs/2001.11525
Autor:
Hartogh, J. W. den, Hirschi, R., Lugaro, M., Doherty, C. L., Battino, U., Herwig, F., Pignatari, M., Eggenberger, P.
Publikováno v:
A&A 629, A123 (2019)
Aims. We investigate the s-process during the AGB phase of stellar models whose cores are enforced to rotate at rates consistent with asteroseismology observations of their progenitors and successors. Methods. We calculated new 2M$_{\odot}$, Z=0.01 m
Externí odkaz:
http://arxiv.org/abs/1908.09160
Publikováno v:
A&A 622, A187 (2019)
Transport of angular momentum has been a challenging topic within the stellar evolution community, even more since the recent asteroseismic surveys. All published studies on rotation using asteroseismic observations show a discrepancy between the obs
Externí odkaz:
http://arxiv.org/abs/1902.04293
Autor:
Cescutti, G., Hirschi, R., Nishimura, N., Hartogh, J. W. den, Rauscher, T., Murphy, A. St. J., Cristallo, S.
Publikováno v:
Mon. Not. Roy. Astron. Soc. 478 (2018) 4101
The main s-process taking place in low mass stars produces about half of the elements heavier than iron. It is therefore very important to determine the importance and impact of nuclear physics uncertainties on this process. We have performed extensi
Externí odkaz:
http://arxiv.org/abs/1805.01250