Results 21 to 30 of about 66,681 (291)

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

Star-planet magnetic interaction and activity in late-type stars with close-in planets

, 2012
Late-type stars interact with their close-in planets through their coronal magnetic fields. We introduce a theory for the interaction between the stellar and planetary fields focussing on the processes that release magnetic energy in the stellar coronae.
A. F. Lanza, Adams, Adams, Berger, Berger, Berger, Browning, Canto Martins, Catala, Chandrasekhar, Christensen, Cohen, Cohen, Cohen, Demoulin, Dixon, Donati, Ehrenreich, Fares, Fares, Finn, Flyer, Getman, Gonzalez, Gu, Hartman, Henry, Ip, Kashyap, Kopp, Lanza, Lanza, Lanza, Lanza, Lecavelier des Etangs, Lecavelier Des Etangs, Linsky, Low, McIvor, Miller, Moutou, Pillitteri, Poppenhaeger, Poppenhaeger, Poppenhaeger, Preusse, Priest, Priest, Reiners, Saar, Scharf, Shkolnik, Shkolnik, Shkolnik, Strassmeier, Taylor, Taylor, Vekstein, Vidotto, Vidotto, Vidotto, Vidotto, Vidotto, Walker, Winn, Wolfson, Woltjer, Zhang, Zhang   +68 more
core   +1 more source

Exploring the Small-scale Magnetic Fields of the Solar Analog KIC 8006161 Using Asteroseismology

The Astrophysical Journal
The magnetic field is a significant and universal physical phenomenon in modern astrophysics. Small-scale magnetic fields are very important in the stellar atmosphere. They are ubiquitous and strongly couple with acoustic waves. Therefore, their presence
Guifang Lin, Yan Li, Jie Su, Tao Wu, Yuetong Wang   +4 more
doaj   +1 more source

Magnetic Field - Stellar Winds Interaction [PDF]

Proceedings of the International Astronomical Union, 2014
AbstractAs per the recent study by the MiMeS collaboration, only about 10% of massive stars possess organized global magnetic fields, typically dipolar in nature. The competition between such magnetic fields and highly non-linear radiative forces that drive the stellar winds leads to a highly complex interaction.
openaire   +1 more source

Structural biology of ferritin nanocages

FEBS Letters, EarlyView.
Ferritin is a conserved iron‐storage protein that sequesters iron as a ferric mineral core within a nanocage, protecting cells from oxidative damage and maintaining iron homeostasis. This review discusses ferritin biology, structure, and function, and highlights recent cryo‐EM studies revealing mechanisms of ferritinophagy, cellular iron uptake, and ...
Eloise Mastrangelo, Flavio Di Pisa
wiley   +1 more source

Magnetic Field Monitoring of Four Massive A–F Supergiants

The Astrophysical Journal Letters
We report magnetic field measurements spanning about 15 yr of four massive (7.5–15 M _⊙ ) supergiant stars: α Per (HD 20902, F5Iab), α Lep (HD 36673A, F0Ib), η Leo (HD 87737, A0Ib) and 13 Mon (HD 46300, A1Ib).
Gregg A. Wade, Mary Oksala, Coralie Neiner, Étienne Boucher, James A. Barron   +4 more
doaj   +1 more source

Butterfly diagram of a Sun-like star observed using asteroseismology

, 2018
Stellar magnetic fields are poorly understood but are known to be important for stellar evolution and exoplanet habitability. They drive stellar activity, which is the main observational constraint on theoretical models for magnetic field generation and ...
Bazot, M., Benomar, O., Christensen-Dalsgaard, J., Gizon, L., Mary, D., Nielsen, M. B., Petit, P., Sreenivasan, K. R., White, T. R.   +8 more
core   +3 more sources

RIPK4 function interferes with melanoma cell adhesion and metastasis

Molecular Oncology, EarlyView.
RIPK4 promotes melanoma growth and spread. RIPK4 levels increase as skin lesions progress to melanoma. CRISPR/Cas9‐mediated deletion of RIPK4 causes melanoma cells to form less compact spheroids, reduces their migratory and invasive abilities and limits tumour growth and dissemination in mouse models.
Norbert Wronski, Sławomir Lasota, Ewelina Madej, Anna A. Brożyna, Małgorzata Szczygieł, Agnieszka Harazin‐Lechowska, Jan Czerbniak, Janusz Rys, Jaroslaw Czyz, Agnieszka Wolnicka‐Glubisz   +9 more
wiley   +1 more source

Searching for Low-mass Stars with Magnetically Induced Hyperinflated Radii

The Astrophysical Journal
Precise empirical estimates of stellar radii have revealed that the radii of certain low-mass stars are inflated relative to stellar structure predictions: the largest inflations occur in magnetically active stars.
D. J. Mullan, J. MacDonald
doaj   +1 more source

The Effects of Rotation, Metallicity, and Magnetic Field on the Islands of Failed Supernovae

The Astrophysical Journal, 2023
Failed supernovae (FSN) are a possible channel for the formation of heavy stellar-mass black holes ( M _BH > ∼30 M _⊙ ). However, the effects of metallicity, rotation, and magnetic field on the islands of explodabilty of massive stars are not clear. Here,
Lei Li, Chunhua Zhu, Sufen Guo, Helei Liu, Guoliang Lü   +4 more
doaj   +1 more source