Zobrazeno 1 - 10
of 77
pro vyhledávání: '"Sekii Takashi"'
We have carried out inversions of travel times as measured by Gizon et al. (2020) to infer the internal profile of the solar meridional circulation (MC). A linear inverse problem has been solved by the regularized least-squares method with a constrai
Externí odkaz:
http://arxiv.org/abs/2406.12077
Publikováno v:
A&A 680, A27 (2023)
We introduce a framework to measure the asphericity of Sun-like stars using $a_1$, $a_2$ and $a_4$ coefficients, and constrain their latitudes of magnetic activity. Systematic errors on the inferred coefficients are evaluated in function of key physi
Externí odkaz:
http://arxiv.org/abs/2308.08779
A scheme of Bayesian rotation inversion, which allows us to compute the probability of a model of a stellar rotational profile, is developed. The validation of the scheme with simple rotational profiles and the corresponding sets of artificially gene
Externí odkaz:
http://arxiv.org/abs/2112.12341
Publikováno v:
Astrophysical Journal, 871, pp 135-145, 2019
The two-dimensional internal rotation of KIC11145123 has been inferred via asteroseismology. Based on the Optimally Localized Averaging method and a simple three-zone modeling of the internal rotation, we have found evidence for a contrast between th
Externí odkaz:
http://arxiv.org/abs/2111.06853
Non-standard modeling of KIC 11145123, a possible blue straggler star, has been asteroseismically carried out based on a scheme to compute stellar models with the chemical compositions in their envelopes arbitrarily modified, mimicking effects of som
Externí odkaz:
http://arxiv.org/abs/2110.06926
Autor:
Kurtz Donald W., Saio Hideyuki, Takata Masao, Shibahashi Hiromoto, Murphy Simon J., Sekii Takashi
Publikováno v:
EPJ Web of Conferences, Vol 101, p 01007 (2015)
We have discovered rotationally split core g-mode triplets and surface p-mode triplets and quintuplets in a terminal age main-sequence A star, KIC 11145123, that shows both δ Sct p-mode pulsations and γ Dor g-mode pulsations. This gives the first r
Externí odkaz:
https://doaj.org/article/87320c845dfd481eaa22038f9c0e8a99
Autor:
Harra, Louise, Andretta, Vincenzo, Appourchaux, Thierry, Baudin, Frédéric, Bellot-Rubio, Luis, Birch, Aaron C., Boumier, Patrick, Cameron, Robert H., Carlsson, Matts, Corbard, Thierry, Davies, Jackie, Fazakerley, Andrew, Fineschi, Silvano, Finsterle, Wolfgang, Gizon, Laurent, Harrison, Richard, Hassler, Donald M., Leibacher, John, Liewer, Paulett, MacDonald, Malcolm, Maksimovic, Milan, Murphy, Neil, Naletto, Giampiero, Nigro, Giuseppina, Owen, Christopher, Martínez-Pillet, Valentín, Rochus, Pierre, Romoli, Marco, Sekii, Takashi, Spadaro, Daniele, Veronig, Astrid, Schmutz, Werner
A mission to view the solar poles from high helio-latitudes (above 60$^\circ$) will build on the experience of Solar Orbiter as well as a long heritage of successful solar missions and instrumentation (e.g. SOHO \cite{SOHO}, STEREO \cite{stereo}, Hin
Externí odkaz:
http://arxiv.org/abs/2104.10876
Autor:
Appourchaux, Thierry, Auchère, Frédéric, Antonucci, Ester, Gizon, Laurent, MacDonald, Malcolm, Hara, Hirohisa, Sekii, Takashi, Moses, Daniel, Vourlidas, Angelos
Publikováno v:
Macdonald M. (eds) Advances in Solar Sailing, pp 259-268, Feb 2014
In this paper, we detail the scientific objectives and outline a strawman payload of the SOLAR sail Investigation of the Sun (SOLARIS). The science objectives are to study the 3D structure of the solar magnetic and velocity field, the variation of to
Externí odkaz:
http://arxiv.org/abs/1707.08193
Autor:
Takada-Hidai, Masahide, Kurtz, Donald W., Shibahashi, Hiromoto, Murphy, Simon J., Takata, Masao, Saio, Hideyuki, Sekii, Takashi
A spectroscopic analysis was carried out to clarify the properties of KIC 11145123 -- the first main-sequence star with a determination of core-to-surface rotation -- based on spectra observed with the High Dispersion Spectrograph (HDS) of the Subaru
Externí odkaz:
http://arxiv.org/abs/1706.04314
Autor:
Gizon, Laurent, Sekii, Takashi, Takata, Masao, Kurtz, Donald W., Shibahashi, Hiromoto, Bazot, Michael, Benomar, Othman, Birch, Aaron C., Sreenivasan, Katepalli R.
Publikováno v:
Science Advances 16 Nov 2016, Vol. 2, no. 11, e1601777
Stars are not perfectly spherically symmetric. They are deformed by rotation and magnetic fields. Until now, the study of stellar shapes has only been possible with optical interferometry for a few of the fastest-rotating nearby stars. We report an a
Externí odkaz:
http://arxiv.org/abs/1611.06435