Results 31 to 40 of about 114,632 (282)

Time-series Doppler images and surface differential rotation of the effectively-single rapidly-rotating K-giant KU Pegasi [PDF]

, 2016
According to most stellar dynamo theories, differential rotation (DR) plays a crucial role for the generation of toroidal magnetic fields. Numerical models predict surface differential rotation to be anti-solar for rapidly-rotating giant stars, i.e ...
Carroll, T. A., Granzer, T., Kriskovics, L., Künstler, A., Kővári, Zs., Oláh, K., Strassmeier, K. G., Vida, K., Weber, M.   +8 more
core   +2 more sources

The Caenorhabditis elegans DPF‐3 and human DPP4 have tripeptidyl peptidase activity

FEBS Letters, EarlyView.
The dipeptidyl peptidase IV (DPPIV) family comprises serine proteases classically defined by their ability to remove dipeptides from the N‐termini of substrates, a feature that gave the family its name. Here, we report the discovery of a previously unrecognized tripeptidyl peptidase activity in DPPIV family members from two different species.
Aditya Trivedi, Rajani Kanth Gudipati
wiley   +1 more source

The Impact of Rotation on the Evolution of Low-Mass Stars

, 2007
High precision photometry and spectroscopy of low-mass stars reveal a variety of properties standard stellar evolution cannot predict. Rotation, an essential ingredient of stellar evolution, is a step towards resolving the discrepancy between model ...
Christopher A. Tout, Daniel Brown, Guenter Houdek, Maurizio Salaris, Rebecca G. Martin, Richard J. Stancliffe   +5 more
core   +1 more source

The Factory and The Beehive I. Rotation Periods For Low-Mass Stars in Praesepe [PDF]

, 2011
Stellar rotation periods measured from single-age populations are critical for investigating how stellar angular momentum content evolves over time, how that evolution depends on mass, and how rotation influences the stellar dynamo and the magnetically ...
Adam Kraus, Baraffe, Barnes, Barnes, Barnes, Barnes, Browning, Covey, Covey, Delfosse, Dotter, Dovi Poznanski, Efron, Eran O. Ofek, Feigelson, Giampapa, Irwin, Irwin, Jenna J. Lemonias, Joshua S. Bloom, Kevin R. Covey, Kiraga, Kraus, Krishnamurthi, Law, Mamajek, Mansi M. Kasliwal, Marcel A. Agüeros, Meibom, Meibom, Monet, Natasha Batalha, Nicholas M. Law, Peter E. Nugent, Robert M. Quimby, S. Bradley Cenko, Shrinivas R. Kulkarni, Skrutskie, Soderblom, Stauffer, Steele, Stoughton, Terndrup, West, York   +44 more
core   +2 more sources

The role and implications of mammalian cellular circadian entrainment

FEBS Letters, EarlyView.
At their most fundamental level, mammalian circadian rhythms occur inside every individual cell. To tell the correct time, cells must align (or ‘entrain’) their circadian rhythm to the external environment. In this review, we highlight how cells entrain to the major circadian cues of light, feeding and temperature, and the implications this has for our
Priya Crosby
wiley   +1 more source

Kepler main-sequence solar-like stars: surface rotation and magnetic-activity evolution

Frontiers in Astronomy and Space Sciences
While the mission’s primary goal was focused on exoplanet detection and characterization, Kepler made and continues to make extraordinary advances in stellar physics. Stellar rotation and magnetic activity are no exceptions.
Ângela R. G. Santos, Diego Godoy-Rivera, Diego Godoy-Rivera, Adam J. Finley, Savita Mathur, Savita Mathur, Rafael A. García, Sylvain N. Breton, Anne-Marie Broomhall   +8 more
doaj   +1 more source

The Directly Imaged Exoplanet Host Star 51 Eridani is a Gamma Doradus Pulsator

The Astrophysical Journal, 2022
51 Eri is well known for hosting a directly imaged giant planet and for its membership to the β Pictoris moving group. Using 2 minute cadence photometry from the Transiting Exoplanet Survey Satellite (TESS), we detect multiperiodic variability in 51 Eri ...
Aldo G. Sepulveda, Daniel Huber, Zhoujian Zhang, Gang Li, Michael C. Liu, Timothy R. Bedding   +5 more
doaj   +1 more source

Molecular bases of circadian magnesium rhythms across eukaryotes

FEBS Letters, EarlyView.
Circadian rhythms in intracellular [Mg2+] exist across eukaryotic kingdoms. Central roles for Mg2+ in metabolism suggest that Mg2+ rhythms could regulate daily cellular energy and metabolism. In this Perspective paper, we propose that ancestral prokaryotic transport proteins could be responsible for mediating Mg2+ rhythms and posit a feedback model ...
Helen K. Feord, Gerben van Ooijen
wiley   +1 more source

Differential Rotation of CoRoT Stars and a Kepler Binary Star from Starspot Transit Mapping

The Astrophysical Journal
While direct magnetic field measurements are rare for slowly rotating stars, spots observed during planetary transits provide a potential indicator of magnetic activity on stellar surfaces.
Adriana Valio, Alexandre Araújo, Fabian Menezes   +2 more
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