Zobrazeno 1 - 9
of 9
pro vyhledávání: '"L. T. Lehmann"'
Autor:
P. Fouqué, E. Martioli, J.-F. Donati, L. T. Lehmann, B. Zaire, S. Bellotti, E. Gaidos, J. Morin, C. Moutou, P. Petit, S. H. P. Alencar, L. Arnold, É. Artigau, T.-Q. Cang, A. Carmona, N. J. Cook, P. Cortés-Zuleta, P. I. Cristofari, X. Delfosse, R. Doyon, G. Hébrard, L. Malo, C. Reylé, C. Usher
Publikováno v:
Astronomy & Astrophysics. 672:A52
Context. The rotation period of stars is an important parameter together with mass, radius, and effective temperature. It is an essential parameter for any radial velocity monitoring, as stellar activity can mimic the presence of a planet at the stel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2fc21204e4fd5ca9ca1c9f95fef99e07
https://doi.org/10.1051/0004-6361/202345839
https://doi.org/10.1051/0004-6361/202345839
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 480:477-487
In the present work, we investigate how the large-scale magnetic field of the Sun, in its three vector components, has evolved during most of cycle 24, from 2010 Jan to 2018 Apr. To filter out the small-scale field of the Sun, present in high-resolut
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b2f880ae6d66924cb37b381ecc93e627
https://doi.org/10.1093/mnras/sty1926
https://doi.org/10.1093/mnras/sty1926
Autor:
Duncan H. Mackay, Moira Jardine, L. T. Lehmann, Aline A. Vidotto, Colin P. Folsom, Victor See, Sandra V. Jeffers, Stephen C. Marsden, Rim Fares, Julien Morin, K. Lund, J.-F. Donati, Pascal Petit
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, 493 (1), pp.1003-1012. ⟨10.1093/mnras/staa297⟩
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, 493 (1), pp.1003-1012. ⟨10.1093/mnras/staa297⟩
Helicity is a fundamental property of a magnetic field but to date it has only been possible to observe its evolution in one star - the Sun. In this paper we provide a simple technique for mapping the large-scale helicity density across the surface o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a40466997ea73c0f3c7d6cfcbb227af4
http://arxiv.org/abs/2001.11749
http://arxiv.org/abs/2001.11749
Numerous attempts to estimate the rate at which low-mass stars lose angular momentum over their lifetimes exist in the literature. One approach is to use magnetic maps derived from Zeeman-Doppler imaging (ZDI) in conjunction with so-called "braking l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ba3eaff0ba1a886dac578272b2d3588
The large-scale magnetic fields of stars can be obtained with the Zeeman-Doppler-Imaging (ZDI) technique, but their interpretation is still challenging as the contribution of the small-scale field or the reliability of the reconstructed field propert
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b6988591766c48bbacadf513d7cd160d
http://arxiv.org/abs/1811.03703
http://arxiv.org/abs/1811.03703
A key question in understanding the observed magnetic field topologies of cool stars is the link between the small- and the large-scale magnetic field and the influence of the stellar parameters on the magnetic field topology. We examine various simu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e8899b4dc9098c988b828e2402f583ef
http://arxiv.org/abs/1805.04420
http://arxiv.org/abs/1805.04420
Publikováno v:
Astronomische Nachrichten. 336:258-265
We present new magnetic field measurements of the K2 main-sequence star ϵ Eri based on principal components analysis (PCA) line-profile reconstructions. The aim of this paper is to quantify the surface-averaged magnetic field and search for possible
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e64fef8f1f74afd6d89acb598e1d744
https://doi.org/10.1002/asna.201412162
https://doi.org/10.1002/asna.201412162
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2021, 500, pp.1243-1260. ⟨10.1093/mnras/staa3284⟩
Monthly Notices of the Royal Astronomical Society, 2021, 500, pp.1243-1260. ⟨10.1093/mnras/staa3284⟩
We are reaching the point where spectropolarimetric surveys have run for long enough to reveal solar-like magnetic activity cycles. In this paper we investigate what would be the best strategy to identify solar-like magnetic cycles and ask which larg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d172b5fe1b07865766cdda278e6d78bf
Autor:
'L. T. Lehmann
Publikováno v:
L. T. Lehmann
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=r3c4b2081b22::75f7f389ecea57d3339b08625866529b