Results 21 to 30 of about 3,312,921 (291)

M-dwarf stellar winds : the effects of realistic magnetic geometry on rotational evolution and planets [PDF]

, 2014
AAV acknowledges support from a Royal Astronomical Society Fellowship. JM acknowledges support from a fellowship of the Alexander von Humboldt foundation.We perform three-dimensional numerical simulations of stellar winds of early-M-dwarf stars.
Morin, J., Gombosi, T.I., Donati, J.F., Opher, M., Gombosi, Tamás, Jardine, M., Morin, Julien, Gombosi, T. I., Vidotto, A. A., Vidotto, A.A., Donati, J. F., Gombosi, Tamas I.   +11 more
core   +1 more source

Masers and Stellar Magnetic Fields [PDF]

Symposium - International Astronomical Union, 1990
Observations of circular polarization of molecular masers associated with late type giant and supergiant stars can be used to estimate the magnetic field strength in the masing region. Magnetic field strengths of ~ 5 mG are deduced for OH masers in circumstellar envelopes at distances of ~ 1016 cm from the star, and magnetic field strengths of ~ 50 G ...
openaire   +1 more source

Machine Learning for Stellar Magnetic Field Determination [PDF]

International Journal of Computational Intelligence Systems, 2018
Abstract In this work we present the results for the automatic determination of the mean longitudinal magnetic field in polarized stellar spectra through the analysis of spectropolarimetric observations. In order to determine this important parameter, we first developed a synthetic database encompassing a set of different stellar spectra, each one ...
J. P. Córdova Barbosa, Silvana Guadalupe Navarro Jiménez, Julio Cesar Ramírez-Vélez   +2 more
openaire   +3 more sources

Evolution of Stellar Magnetic Fields [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractStellar magnetic fields can reliably be characterized by several magnetic activity indicators, such as X-ray or radio luminosity. Physical processes leading to such emission provide important information on dynamic processes in stellar atmospheres and magnetic structuring.
openaire   +1 more source

The magnetic fields of intermediate-mass T Tauri stars. I. Magnetic detections and fundamental stellar parameters [PDF]

, 2019
International audienceContext : .The origin of the fossil magnetic fields detected in 5 to 10% of intermediate-mass main sequence stars is still highly debated.
Johns-Krull, C., F. Gallet, Lebreton, Y.,, Johns-Krull, C.,, Bouvier, J.,, Petit, P., Haemmerlé, L., Böhm, T., T. Böhm, Charbonnel, C.,, J. Morin, Haemmerle, L.,, Marsden, S. C., Charbonnel, Corinne, Marsden, C., Morin, J., L. Haemmerlé, Kochukhov, Oleg,, Lebreton, Y., Petit, P.,, C. Charbonnel, Charbonnel, C., Alecian, E.,, Amard, L.,, Hussain, G.,, Alecian, E., Morin, J.,, Folsom, C. P.,, G. Hussain, S. C. Marsden, Folsom, C. P., P. Petit, Hussain, G., Amard, L., E. Alecian, C. Johns-Krull, Marsden, S. C.,, L. Amard, J. Bouvier, C. P. Folsom, Villebrun, F.,, Y. Lebreton, Bouvier, J., O. Kochukhov, Gallet, F.,, Folsom, C., Bohm, T.,, Villebrun, F., Gallet, F., Kochukhov, O., F. Villebrun   +50 more
core   +1 more source

The basic role of magnetic fields in stellar evolution [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractMagnetic field is playing an important role at all stages of star evolution from star formation to the endpoints. The main effects are briefly reviewed. We also show that O–type stars have large convective envelopes, where convective dynamo could work.
Maeder, André, Meynet, Georges, Georgy, Cyril, Ekström, Sylvia   +3 more
openaire   +2 more sources

Stellar magnetism : empirical trends with age and rotation [PDF]

, 2014
AAV acknowledges support from a Royal Astronomical Society Fellowship and from the Swiss National Science Foundation via an Ambizione Fellowship. SGG acknowledges support from the Science and Technology Facilities Council (STFC) via an Ernest Rutherford ...
G. Hussain, Jeffers, S., Do Nascimento Jr., J.D., Waite, I.A., R. Fares, Folsom, C. P., Gregory, S. G.; id_orcid, P. Petit, Gregory, S. G., Hussain, G., do Nascimento, J. D., Donati, J. -F., Jardine, M., M. Jardine, Vidotto, A. A., Petit, P., I. A. Waite, Marsden, S., S. Marsden, Vidotto, A. A, Nascimento Júnior, José Dias do, Donati, J.F., J. Bouvier, J. Morin, J. D. Do Nascimento, Nascimento, J. D. Do, C. P. Folsom, Donati, J. F., Morin, J., Bouvier, J., J. F. Donati, Waite, I. A., Gregory, S.G., Jeffers, Sandra V., Fares, R., Hussain, G. A. J., Cameron, A. C., A. A. Vidotto, Morin, Julien, do Nascimento Jr., J.-D., A. C. Cameron, S. Jeffers, Cameron, A.C., S. G. Gregory, Vidotto, A.A., Folsom, C.P.   +45 more
core   +1 more source

Stellar Magnetic Storm Induced Magnetospheric Polarity Reversals: A Potential Diagnostic for Distinguishing Unmagnetized and Magnetized (Exo)planets

The Astrophysical Journal
(Exo)planetary environments are forced by stellar activity, which manifest through variable radiation, particle and magnetic fluxes, stellar winds, flares, and magnetic storms known as coronal mass ejections (CMEs). Recent studies have shown that planets
Sakshi Gupta, Souvik Roy, Dibyendu Nandy
doaj   +1 more source

Microbiome‐blood–brain barrier interactions in aging — mechanisms and therapeutic potential

FEBS Letters, EarlyView.
Aging reshapes the gut microbiome (↓SCFA‐producing commensals; ↑pro‐inflammatory outputs), shifting circulating metabolites (↓SCFAs; ↑LPS, ↑TMAO, ↑PAA) that act at the BBB to increase nonspecific transcytosis, alter transport, and promote astrocyte reactivity, heightening brain vulnerability.
Daniel Cuervo‐Zanatta, Hari Baskar Balasubramanian, Amir Pasokh, Marietta Zille   +3 more
wiley   +1 more source

Emerging experimental and computational methods for studying redox‐regulated structural transitions

FEBS Letters, EarlyView.
Redox reactions can reshape proteins and alter how they behave in cells, with important consequences for health and disease. This review explores emerging experimental and computational approaches for discovering these redox‐sensitive protein switches, revealing their structural effects, and predicting their behavior, opening new opportunities to ...
Tasneem Rass, Dana Reichmann, Gábor Erdős   +2 more
wiley   +1 more source