Results 121 to 130 of about 15,327 (291)

Hamilton Echelle Spectrograph Observations of Solar Analog Field Stars: Lithium Abundance and Activity

The Astronomical Journal
We measured lithium (Li) abundance and instantaneous chromospheric Ca ii HK activity in Hamilton Echelle Spectrograph observations of 211 solar analog field stars, with one objective being potential identification of grand minimum candidates for ongoing ...
Dan Lubin, Bradford P. Holden, Camille Stock, Carl Melis, David Tytler   +4 more
doaj   +1 more source

Polar branches of stellar activity waves: dynamo models and observations

, 2011
Aims. Stellar activity data provide evidence of activity wave branches propagating polewards rather than equatorwards (the solar case). This evidence is especially pronounced for the well-observed subgiant HR 1099.
A. F. Lanza, D. Sokoloff, D. Moss
core   +1 more source

Linking neurogenesis, oligodendrogenesis, and myelination defects to neurodevelopmental disruption in primary mitochondrial disorders

FEBS Letters, EarlyView.
Mitochondrial remodeling shapes neural and glial lineage progression by matching metabolic supply with demand. Elevated OXPHOS supports differentiation and myelin formation, while myelin compaction lowers mitochondrial dependence, revealing mitochondria as key drivers of developmental energy adaptation.
Sahitya Ranjan Biswas, Porter L. Tomsick, Alicia M. Pickrell, Paul D. Morton   +3 more
wiley   +1 more source

Molecular Hydrogen Controls the Temperatures of Flares on TRAPPIST-1

The Astrophysical Journal Letters
Early JWST observations of TRAPPIST-1 have revealed an unexpected puzzle: energetic white-light flares ( E  > 10 ^30 erg) reach temperatures of only ∼3500–4000 K, nearly 3 times cooler than typical solar flares, which peak around 9000–10,000 K.
A. I. Shapiro, N. Kostogryz, S. Seager, V. Witzke, J. de Wit, V. Vasilyev, Astrid M. Veronig, Cameron Robert, Peter Hardi, S. K. Solanki   +9 more
doaj   +1 more source

Gliese 832c: Stellar Activity or Exoplanet? .

, 2020
Tesis presentada para optar al grado de Magíster en Ciencias con mención en Física.Exoplanets are planets located outside our Solar System. The search of these objects have grown during the years due to the scientific interest and to the advances on ...
Gorrini Huaiquimilla, Paula
core  

Stacked Bayesian general Lomb-Scargle periodogram : identifying stellar activity signals

, 2017
The research leading to these results received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement number 313014 (ETAEARTH). ACC acknowledges support from STFC grant ST/M001296/1.Context.
A. Mortier, Collier Cameron, A., Mortier, A.; id_orcid, Mortier, A., Cameron, A. Collier, A. Collier Cameron   +5 more
core   +1 more source

An isoform of 14‐3‐3 protein regulates transbilayer lipid movement at the plasma membrane

FEBS Letters, EarlyView.
Loss of 14‐3‐3ζ in CHO cells confers resistance to exogenous phosphatidylserine (PS) and impairs endocytosis‐independent inward flip‐flop of fluorescent PS at the plasma membrane. RNAi‐mediated knockdown reproduces this defect, while no additive effect is seen in ATP11C‐deficient cells.
Akiko Yamaji‐Hasegawa, Akira Hattori, Masafumi Tsujimoto, Toshihide Kobayashi   +3 more
wiley   +1 more source

Antisolar Differential Rotation May Have Revived Magnetic Braking in the Subgiant 31 Aquilae

The Astronomical Journal
Recent observations have shown that sufficiently slow rotation disrupts the organization of large-scale magnetic field in older main-sequence stars, leading to weakened magnetic braking (WMB) and a collapse in the efficiency of the global stellar dynamo.
Travis S. Metcalfe, Jennifer L. van Saders, Thomas R. Ayres, Derek Buzasi, Jeremy J. Drake, Ricky Egeland, Rafael A. García, Oleg Kochukhov, Steven H. Saar, Keivan G. Stassun, Sarbani Basu, J. M. Joel Ong, Amalie Stokholm, Timothy R. Bedding, Sylvain N. Breton, Ilya V. Ilyin, Pascal Petit, Marc H. Pinsonneault, Klaus G. Strassmeier   +18 more
doaj   +1 more source

The ubiquitin ligase RNF115 is required for the clearance of damaged lysosomes

FEBS Letters, EarlyView.
Upon lysosomal rupture, an E3 ubiquitin ligase RNF115 translocates from the cytosol to the damaged lysosomal membrane. Moreover, RNF115 depletion impairs the clearance of damaged lysosomes, identifying it as a key regulator of lysosomal quality control.
Sae Nakanaga, Toshiki Takahashi, Akiko Kuma, Hiroyuki Kawahara   +3 more
wiley   +1 more source

Closeby Habitable Exoplanet Survey (CHES). I. Astrometric Noise and Planetary Detection Efficiency Due to Stellar Spots and Faculae

The Astronomical Journal
The Closeby Habitable Exoplanet Survey (CHES) is dedicated to the astrometric exploration for habitable-zone Earth-like planets orbiting solar-type stars in close proximity, achieving unprecedented microarcsecond precision.
Chunhui Bao, Jianghui Ji, Dongjie Tan, Guo Chen, Xiumin Huang, Su Wang, Yao Dong   +6 more
doaj   +1 more source