Results 11 to 20 of about 15,242 (225)

Theory of Stellar Oscillations

, 2017
In recent years, astronomers have witnessed major progresses in the field of stellar physics. This was made possible thanks to the combination of a solid theoretical understanding of the phenomena of stellar pulsations and the availability of a ...
A. Jiménez, C. Aerts, C. Fröhlich, D. Reese, D.G. Koch, F. Lignières, F.-L. Deubner, G.A. Verner, H. Kjeldsen, I.W. Roxburgh, J. Christensen-Dalsgaard, M. Takata, M. Takata, M. Tassoul, M.S. Cunha, M.S. Cunha, M.S. Cunha, M.S. Cunha, M.S. Cunha, P. Smeyers, R.A. García, R.A. García, R.L. Gilliland, S. Basu, T. Appourchaux, T.M. Brown, V. Domingo, W. Unno, Y.V. Vandakurov   +28 more
core   +1 more source

Slowing down atomic diffusion in subdwarf B stars: mass loss or turbulence? [PDF]

, 2011
Subdwarf B stars show chemical peculiarities that cannot be explained by diffusion theory alone. Both mass loss and turbulence have been invoked to slow down atomic diffusion in order to match observed abundances.
Angulo, Badnell, Baran, Blanchette, Brown, Burgers, Böhm-Vitense, C. A. Tout, Cassisi, Charbonneau, Charpinet, Charpinet, Chayer, Dupret, E. Glebbeek, Edelmann, Edelmann, Eggleton, Eggleton, Fontaine, Fontaine, Fontaine, Formicola, Freytag, Geier, Green, Grevesse, Haili Hu, Han, Heber, Heber, Herwig, Hu, Hu, Hu, Iglesias, Itoh, Itoh, Jeffery, Kawaler, Kilkenny, Kupka, M.-A. Dupret, Mendoza, Michaud, Michaud, O’Toole, O’Toole, Paquette, Pols, Seaton, Seaton, Seaton, Thoul, Théado, Turcotte, Unglaub, Unglaub, Vink, Vink, Vink, Vink   +61 more
core   +1 more source

On the excitation of PG1159-type pulsations [PDF]

, 2005
Stability properties are presented of dipole and quadrupole nonradial oscillation modes of model stars that experienced a late helium shell flash on their way to the white-dwarf cooling domain.
A. Gautschy, Althaus, Bradley, Brassard, Cox, Dreizler, Fontaine, Gautschy, Gautschy, Gautschy, H. Saio, Herwig, Kawaler, Kawaler, L. G. Althaus, Nagel, O'Brien, O'Brien, Quirion, Starrfield, Steffen, Unglaub, Vauclair, Werner, Winget, Winget   +25 more
core   +4 more sources

High-cadence spectroscopy of M-dwarfs – II. Searching for stellar pulsations with HARPS [PDF]

, 2017
Stellar oscillations appear all across the Hertzsprung–Russell diagram. Recent theoretical studies support their existence also in the atmosphere of M dwarfs. These studies predict for them short periodicities ranging from 20 min to 3 h.
Amado, P. J., Anglada-Escudé, G., Barnes, J. R., Berdiñas, Z. M., MacDonald, J., Rodríguez-López, C., Sarmiento, L. F., Zechmeister, M.   +7 more
core   +3 more sources

Thermal Evolution of a Pulsating Neutron Star

, 2005
We have derived a set of equations to describe the thermal evolution of a neutron star which undergoes small-amplitude radial pulsations. We have taken into account, in the frame of the General Theory of Relativity, the pulsation damping due to the bulk ...
Gnedin, O. Y., Gusakov, M. E., Yakovlev, D. G.   +2 more
core   +3 more sources

On the Nature of the Radial Velocity Variability of Aldebaran: A Search for Spectral Line Bisector Variations [PDF]

, 1997
The shape of the Ti I 6303.8 A spectral line of Aldebaran as measured by the line bisector was investigated using high signal-to-noise, high resolution data. The goal of this study was to understand the nature of the 643-day period in the radial velocity
Cochran, William D., Hatzes, Artie P.
core   +3 more sources

Function‐driven design of a surrogate interleukin‐2 receptor ligand

FEBS Letters, EarlyView.
Interleukin (IL)‐2 signaling can be achieved and precisely fine‐tuned through the affinity, distance, and orientation of the heterodimeric receptors with their ligands. We designed a biased IL‐2 surrogate ligand that selectively promotes effector T and natural killer cell activation and differentiation. Interleukin (IL) receptors play a pivotal role in
Ziwei Tang, Zelin Cheng, Teng Li, Fulian Wang, Liangminghui Zhang, Xiuxiu He, Lili Liu, Wei Wang, Aibin Liang, Guang Yang   +9 more
wiley   +1 more source

Time after time – circadian clocks through the lens of oscillator theory

FEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo, Carolin Ector, Hanspeter Herzel   +2 more
wiley   +1 more source

It takes a village to raise a tide: nonlinear multiple-mode coupling and mode identification in KOI-54 [PDF]

, 2014
We explore the tidal excitation of stellar modes in binary systems using Kepler observations of the remarkable eccentric binary KOI-54 (HD 187091; KIC 8112039), which displays strong ellipsoidal variation as well as a variety of linear and nonlinear ...
Burkart, Joshua, O'Leary, Ryan M.
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