Results 61 to 70 of about 66,681 (291)

HD 158450: A MAGNETIC CHEMICALLY PECULIAR STAR IN A YOUNG STELLAR GROUP

Odessa Astronomical Publications, 2008
We report on the discovery of the Zeeman resolved spectral lines, corresponding to the very large magnetic field modulus [H] = 11.1 kG, in the spectrum of the chemically peculiar star HD 158450 belonging to the recently discovered Mamajek 2 stellar group.
N. A. Drake, E. G. Jilinski, V. G. Ortega, R. de la Reza, B. Bazzanella   +4 more
doaj   +1 more source

Stellar Cycles in Fully Convective Stars and a New Interpretation of Dynamo Evolution

The Astrophysical Journal, 2023
An α Ω dynamo, combining shear and cyclonic convection in the tachocline, is believed to generate the solar cycle. However, this model cannot explain cycles in fast rotators (with minimal shear) or in fully convective stars (no tachocline); an analysis ...
Zackery A. Irving, Steven H. Saar, Bradford J. Wargelin, José-Dias do Nascimento Jr   +3 more
doaj   +1 more source

The non-dipolar magnetic fields of accreting T Tauri stars

, 2008
Models of magnetospheric accretion on to classical T Tauri stars often assume that stellar magnetic fields are simple dipoles. Recently published surface magnetograms of BP Tau and V2129 Oph have shown, however, that their fields are more complex.
Altschuler, Azevedo, Beristain, Bessolaz, Bouvier, Bouvier, Broeg, Browning, Chuntonov, Clarke, Collier Cameron, Donati, Donati, Donati, Edwards, Eisner, Favata, Ferreira, Ferreira, Flaccomio, Fleck, Getman, Getman, Gregory, Gregory, Gregory, Gregory, Gullbring, Hartmann, Hussain, J.-F. Donati, Jardine, Jardine, Johns-Krull, Johns-Krull, Johns-Krull, Kurosawa, Königl, Küker, Lin, Liu, Long, Long, Long, M. Jardine, Mahdavi, Matt, Matt, Matt, Matt, Mohanty, Muzerolle, Najita, Riley, Robitaille, Romanova, Romanova, Romanova, S. G. Gregory, S. P. Matt, Shu, Siess, Simon, Symington, Terquem, Valenti, Valenti, van Ballegooijen, Wang, Willis   +69 more
core   +3 more sources

Predicting Epileptogenic Tubers in Patients With Tuberous Sclerosis Complex Using a Fusion Model Integrating Lesion Network Mapping and Machine Learning

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Accurate localization of epileptogenic tubers (ETs) in patients with tuberous sclerosis complex (TSC) is essential but challenging, as these tubers lack distinct pathological or genetic markers to differentiate them from other cortical tubers.
Tinghong Liu, Qi Wang, Suhui Kuang, Dezhi Cao, Ping Ding, Shaohui Zhang, Haihua Wei, Zhirong Wei, Jinshan Xu, Xinyu Huang, Bing Liu, Shuli Liang   +11 more
wiley   +1 more source

Starspots: A Key to the Stellar Dynamo

Living Reviews in Solar Physics, 2005
Magnetic activity similar to that of the Sun is observed on a variety of cool stars with external convection envelopes. Stellar rotation coupled with convective motions generate strong magnetic fields in the stellar interior and produce a multitude of ...
Berdyugina Svetlana V.
doaj  

Modeling YSO Jets in 3D. II. Accretion-fed, Star-anchored Poynting Jets in the Low-density Polar Cavity Powered by Disk–Magnetosphere Interaction

The Astrophysical Journal
The origin of the jets in young stellar objects (YSOs) remains a subject of active investigation. We present a 3D MHD simulation of the jet launching in YSOs, focusing on the interaction between the stellar magnetosphere and the accretion disk.
Yisheng Tu, Zhi-Yun Li, Zhaohuan Zhu, Xiao Hu, Chun-Yen Hsu   +4 more
doaj   +1 more source

Simulations of facular magnetic fields on cool stars

Astronomy & Astrophysics
Context. Stellar convection in the presence of magnetic field affects the emergent intensity, as well as the structure and evolution of cool main-sequence dwarfs. Aims.
Singh Bhatia Tanayveer, Cameron Robert H., Solanki Sami K., Przybylski Damien F., Witzke Veronika, Shapiro Alexander, Kostogryz Nadiia   +6 more
doaj   +1 more source

Seismological insights into solar and stellar magnetic activity cycles

EPJ Web of Conferences, 2017
The Sun’s magnetic activity cycle varies primarily on a time scale of approximately 11yrs from minimum to maximum and back again. It is well-known that the properties of the Sun’s acoustic oscillations are affected by the near-surface internal magnetic ...
Broomhall Anne-Marie
doaj   +1 more source

Modification of the MOOG spectral synthesis codes to account for Zeeman broadening of spectral lines

, 2013
In an attempt to widen access to the study of magnetic fields in stellar astronomy, I present MOOGStokes, a version of the MOOG one-dimensional LTE radiative transfer code, overhauled to incorporate a Stokes vector treatment of polarized radiation ...
Deen, Casey
core   +1 more source

ALS With and Without Upper Motor Neuron Signs: A Comparative Study Supporting the Gold Coast Criteria

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective The Gold Coast criteria permit diagnosis of amyotrophic lateral sclerosis (ALS) even without upper motor neuron (UMN) signs. However, whether ALS patients with UMN signs (ALSwUMN) and those without (ALSwoUMN) share similar characteristics and prognoses remains unclear.
Hee‐Jae Jung, E‐nae Cheong, Jungmin So, Heung‐Won Kang, Yangsean Choi, Eun‐Jae Lee, Hyunjin Kim, Young‐Min Lim   +7 more
wiley   +1 more source