Results 91 to 100 of about 15,327 (291)

The Evolution of Stellar X-Ray Activity and Angular Momentum as Seen by eROSITA, TESS, and Gaia

The Astrophysical Journal Letters
We have assembled a sample of ∼8200 stars with spectral types F5V–M5V, all having directly measured X-ray luminosities from eROSITA and rotation periods from TESS and having empirically estimated ages via their membership in stellar clusters and groups ...
Keivan G. Stassun, Marina Kounkel
doaj   +1 more source

Photometric magnetic-activity metrics tested with the Sun: application to Kepler M dwarfs

Journal of Space Weather and Space Climate, 2014
The Kepler mission has been providing high-quality photometric data leading to many breakthroughs in the exoplanet search and in stellar physics. Stellar magnetic activity results from the interaction between rotation, convection, and magnetic field ...
Mathur Savita, Salabert David, García Rafael A., Ceillier Tugdual   +3 more
doaj   +1 more source

Observing stellar activity from space

, 2003
In this paper we present a review of the past, current and future space missions relevant for observing stellar activity from space. In the past, missions were focused on UV and X-ray fluxes, variability and spectroscopy. Currently coronal spectroscopy
B. H. Foing, C. Neiner
core   +1 more source

The energy budget of stellar magnetic fields [PDF]

, 2015
VS acknowledges the support of an Science & Technology Facilities Council (STFC) studentship. AAV acknowledges support from the Swiss National Science Foundation through an Ambizione Fellowship.
Fares, R.,, Gregory, S. G.; id_orcid, Rosén, L., Waite, I. A.,, Rosén, Lisa, Bouvier, J.,, Petit, P., Jeffers, Sandra Victoria, do Nascimento, J. D., Jr.,, Nascimento, J. D., Do, Rosén, Lisa,, See, Wyke Chun Victor, Marsden, S. C., See, V., Donati, J. F., Morin, J., Jardine, Moira Mary, Fares, R., Hussain, G. A. J., Petit, P.,, Moutou, C., Saikia, S. Boro, Donati, J.-F., Hussain, Gaitee Ara Jaffer, Hussain, G.,, Morin, J.,, do Nascimento, Jose-Dias Jr., Vidotto, Aline, Jeffers, S. V., Folsom, C. P.,, Nascimento, J. D.,, Moutou, C.,, Folsom, C. P., do Nascimento, J. D., Jr., Vidotto, A. A.,, Gregory, S. G., do Nascimento, J. D., Hussain, G., Donati, J. -F., Jardine, M., Vidotto, A. A., Jardine, M.,, Boro Saikia, S., Nascimento Júnior, José Dias do, Marsden, S. C.,, Saikia, S. Boro,, Gregory, Scott, See, V.,, Bouvier, J., Waite, I. A., Jeffers, Sandra V., Waite, A., Morin, Julien, Fares, Rim, Donati, J. -F, do Nascimento Jr., J. D., Jeffers, S.V.   +56 more
core   +1 more source

Modeling Stellar Activity-rotation Relations in Unsaturated Cool Stars

, 2021
We apply a surface flux transport model developed for the Sun to reconstruct the stellar activity-rotation relationship, LX/Lbol versus Ro, observed for unsaturated cool stars (Rossby numbers Ro ≳ 0.1).
Li, Minjing, Alexander, David, Farrish, Alison O., Johns-Krull, Christopher M.   +3 more
core   +1 more source

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

FEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva, Ariann E. Mendoza‐Martínez, P. Abril Medina‐Flores, Carlos Campero‐Basaldua, Alexander DeLuna, Soledad Funes   +5 more
wiley   +1 more source

Eridani: rotational distortion, stellar and circumstellar activity

, 2006
We explore the geometrical distortion and the stellar and circumstellar activity of α Eri (HD 10144), the brightest Be star in the sky. We present a thorough discussion of the fundamental parameters of the object for an independent determination of ...
M. M. F. Vinicius, Vinicius, M. M. F., R. S. Levenhagen, J. Zorec, N. V. Leister, Zorec, J., Leister, N. V., Levenhagen, R. S.   +7 more
core   +1 more source

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

Organ‐specific redox imbalances in spinal muscular atrophy mice are partially rescued by SMN antisense oligonucleotides

FEBS Letters, EarlyView.
We identified a systemic, progressive loss of protein S‐glutathionylation—detected by nonreducing western blotting—alongside dysregulation of glutathione‐cycle enzymes in both neuronal and peripheral tissues of Taiwanese SMA mice. These alterations were partially rescued by SMN antisense oligonucleotide therapy, revealing persistent redox imbalance as ...
Sofia Vrettou, Brunhilde Wirth
wiley   +1 more source

TESS Asteroseismology of β Hydri: A Subgiant with a Born-again Dynamo

The Astrophysical Journal
The solar-type subgiant β Hyi has long been studied as an old analog of the Sun. Although the rotation period has never been measured directly, it was estimated to be near 27 days.
Travis S. Metcalfe, Jennifer L. van Saders, Daniel Huber, Derek Buzasi, Rafael A. García, Keivan G. Stassun, Sarbani Basu, Sylvain N. Breton, Zachary R. Claytor, Enrico Corsaro, Martin B. Nielsen, J. M. Joel Ong, Nicholas Saunders, Amalie Stokholm, Timothy R. Bedding   +14 more
doaj   +1 more source