Results 1 to 10 of about 66,562 (173)

Observations of Cool-Star Magnetic Fields [PDF]

Living Reviews in Solar Physics, 2012
Cool stars like the Sun harbor convection zones capable of producing substantial surface magnetic fields leading to stellar magnetic activity. The influence of stellar parameters like rotation, radius, and age on cool-star magnetism, and the importance ...
Ansgar Reiners
doaj   +4 more sources

Measuring the magnetic fields in the chromospheres of low-mass stars [PDF]

Nature Communications
Magnetic fields in the upper atmospheres of solar-like stars are believed to provide an enormous amount of energy to power the hot coronae and drive large-scale eruptions that could impact the habitability of planetary systems around these stars. However,
Tianqi Cang, Pascal Petit, Jean-François Donati, Hui Tian, Jianning Fu, Hao Li, Stefano Bellotti, Xueying Hu, Xiaoyu Ma, Arturo Lopez Ariste, Keyu Xing, Julien Morin, Hongpeng Lu, Weikai Zong   +13 more
doaj   +3 more sources

Magnetic Fields in Stellar Jets [PDF]

The Astrophysical Journal, 2007
Although several lines of evidence suggest that jets from young stars are driven magnetically from accretion disks, existing observations of field strengths in the bow shocks of these flows imply that magnetic fields play only a minor role in the dynamics at these locations. To investigate this apparent discrepancy we performed numerical simulations of
Hartigan, P., Frank, A., Varniere, P., Blackman, E.G.   +3 more
openaire   +8 more sources

Modelling stellar coronal magnetic fields [PDF]

Proceedings of the International Astronomical Union, 2010
AbstractOur understanding of the structure and dynamics of stellar coronae has changed dramatically with the availability of surface maps of both star spots and also magnetic field vectors. Magnetic field extrapolations from these surface maps reveal surprising coronal structures for stars whose masses and hence internal structures and dynamo modes may
Jardine, Moira, Donati, Jean-Francois, Arzoumanian, Doris, de Vidotto, Aline   +3 more
openaire   +3 more sources

Multiple views of magnetism in cool stars [PDF]

, 2012
Magnetic fields are regarded as a crucial element for our understanding of stellar physics. They can be studied with a variety of methods which provide complementary - and sometimes contradictory - information about the structure, strength and dynamics ...
Arzoumanian, Basri, Cohen, Donati, Fares, Gregory, Hale, Hallinan, Hussain, Jeffers, McIvor, Morin, Peterson, Poppenhaeger, Reiners, Reiners, Reiners, Route, Semel, Shulyak, Torres, Vidotto, Vidotto, Vogt, Walkowicz   +24 more
core   +3 more sources

Roadmap on the theoretical work of BinaMIcS [PDF]

, 2013
We review the different theoretical challenges concerning magnetism in interacting binary or multiple stars that will be studied in the BinaMIcS (Binarity and Magnetic Interactions in various classes of Stars) project during the corresponding ...
Alecian, E., collaboration, the BinaMIcS, Mathis, S., Neiner, C., Wade, G. A.   +4 more
core   +1 more source

The Direct Effect of Toroidal Magnetic Fields on Stellar Oscillations: An Analytical Expression for the General Matrix Element [PDF]

, 2017
Where is the solar dynamo located and what is its modus operandi? These are still open questions in solar physics. Helio- and asteroseismology can help answer them by enabling us to study solar and stellar internal structures through global oscillations.
Kiefer, René, Roth, Markus, Schad, Ariane   +2 more
core   +2 more sources

Constraints on Magnetic Braking from the G8 Dwarf Stars 61 UMa and τ Cet

The Astrophysical Journal Letters, 2023
During the first half of their main-sequence lifetimes, stars rapidly lose angular momentum to their magnetized winds, a process known as magnetic braking.
Travis S. Metcalfe, Klaus G. Strassmeier, Ilya V. Ilyin, Jennifer L. van Saders, Thomas R. Ayres, Adam J. Finley, Oleg Kochukhov, Pascal Petit, Victor See, Keivan G. Stassun, Sandra V. Jeffers, Stephen C. Marsden, Julien Morin, Aline A. Vidotto   +13 more
doaj   +1 more source

Core-envelope Decoupling Drives Radial Shear Dynamos in Cool Stars

The Astrophysical Journal Letters, 2023
Differential rotation is thought to be responsible for the dynamo process in stars like our Sun, driving magnetic activity and starspots. We report that starspot measurements in the Praesepe open cluster are strongly enhanced only for stars that depart ...
Lyra Cao, Marc H. Pinsonneault, Jennifer L. van Saders   +2 more
doaj   +1 more source

Magnetic Inhibition of Convection and the Fundamental Properties of Low-Mass Stars. II. Fully Convective Main Sequence Stars [PDF]

, 2014
We examine the hypothesis that magnetic fields are inflating the radii of fully convective main sequence stars in detached eclipsing binaries (DEBs). The magnetic Dartmouth stellar evolution code is used to analyze two systems in particular: Kepler-16 ...
Chaboyer, Brian, Feiden, Gregory A.
core   +3 more sources