Results 31 to 40 of about 3,488,609 (297)
Stellar magnetic field database and extrapolation method
Astronomy & AstrophysicsContext. During the past two decades, thousands of stellar magnetic fields have been measured using the Zeeman-Doppler imaging method. No unified database gathers all measurements in a homogeneous way. Aims.
Duchêne Noémie +2 more
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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.
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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 +2 more
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The Astrophysical Journal, 2023 The magnetic activity of a star—which modulates the stellar wind outflow—shapes the immediate environments of orbiting (exo)planets and induces atmospheric loss, thereby impacting their habitability.
Sakshi Gupta +2 more
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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 ...
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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 +3 more
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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
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Pediatric Blood &Cancer, EarlyView.ABSTRACT Pediatric intramedullary low‐grade gliomas (PIMLGGs) are rare neoplasms that present unique clinical and management challenges. Although surgery remains the primary tool for tissue diagnosis and decompression, complete gross‐total resection is frequently unfeasible due to the infiltrative nature of these lesions.
Olga M. Sergeenko +5 more
wiley +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 +3 more
wiley +1 more source
Magnetic Field Monitoring of Four Massive A–F Supergiants
The Astrophysical Journal LettersWe 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 +4 more
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