Results 101 to 110 of about 2,624,667 (213)

Perturbations to Stellar Structure in 2D: Stellar Rotation and Heating in X-ray Binaries [PDF]

arXiv, 2002
We have developed a numerical code with which we study the effects of 2D perturbations on stellar structure. We present new numerical and analytical results on the heating of a main-sequence star in a binary system by its companion.
arxiv  

Limits on the Efficacy of Wave‐Particle Interaction on the Energization and Transport of Atomic and Molecular Heavy Ionospheric Ions

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract Ionospheric molecular ions, such as N2+ ${\mathrm{N}}_{2}^{+}$, NO+, and O2+ ${\mathrm{O}}_{2}^{+}$, have been observed in Earth's high‐altitude ionosphere and the magnetosphere by several spacecraft missions. Their presence not only indicates that they obtain sufficient energy through effective energization mechanisms, predominantly during ...
Mei‐Yun Lin, Raluca Ilie, Alex Glocer
wiley   +1 more source

Self-consistent gas and stellar dynamics of disk galaxies: A problem of dark mass [PDF]

Astrophysics and Space Science Library, 2006, v.337, p.337-344 (In: Astrophysical Disks / Alexei M. Fridman, et al (eds.). Publ. by Springer, Dordrecht, The Netherlands, 2006), 2010
We present results of numerical modeling made for the galactic stellar and stellar-gas disk embedded in the spherical halo and bulge. The stellar disk is simulated by N-body system, the equations of hydrodynamics are solved by TVD-method. We used TREEcode-algorithm for calculation of a self-gravity in stellar and gaseous components.
arxiv  

The dynamic universe: realizing the potential of classical time domain and multimessenger astrophysics

Frontiers in Astronomy and Space Sciences
In parallel with the multi-messenger revolution, major advances in time-domain astronomy across multiple science disciplines relevant to astrophysics are becoming more urgent to address.
R. Sambruna, J. Racusin, Eric Perlman, S. B. Howell, SB Howell, D. Howell, R. Street, M. Soares-Furtado, TP Greene, D. Howell, R. Street, Brian Jackson, Thomas P. Greene   +12 more
semanticscholar   +1 more source

Gravity and Radio Science Investigation at the Moons of Uranus to Reveal Subsurface Oceans and Characterize Interior Structures

Journal of Geophysical Research: Planets, Volume 130, Issue 4, April 2025.
Abstract The prospect that the five major moons of Uranus could host subsurface oceans makes them high‐priority targets for future exploration. Different techniques can be used to search for deep oceans in these objects. Here, we focus on ocean detection and characterization from measurements of the moons' response to the gravitational tides and ...
Flavio Petricca, Damon Landau, Mohit Melwani Daswani, Julie Castillo‐Rogez   +3 more
wiley   +1 more source

Uncertainties in stellar abundance analyses [PDF]

arXiv, 2003
Over the last half-century quantitative stellar spectroscopy has made great progress. However, most stellar abundance analyses today still employ rather simplified models, which can introduce severe systematic errors swamping the observational errors. Some of these uncertainties for late-type stars are briefly reviewed here: atomic and molecular data ...
arxiv  

Data‐Driven Transfer Functions From Differential Magnetometer Measurements to Enhance GIC Model Validation Capability: A Case Study in the Spanish Power Grid

Space Weather, Volume 23, Issue 4, April 2025.
Abstract Geomagnetically induced currents (GICs) are unwanted currents flowing in long grounded conductors because of space weather phenomena. Example GICs are those flowing in power transmission lines via grounded transformer neutrals. Prediction models, used to foresee the amplitudes and waveforms of those currents and to identify weak points in ...
S. Marsal, J. M. Torta, A. Martí, R. Hafizi, P. Piña‐Varas, A. Marcuello, J. Ledo, J. J. Curto, P. Queralt, O. Cid, M. Ibañez   +10 more
wiley   +1 more source

The formation of planetary disks and winds: an ultraviolet view

, 2008
Planetary systems are angular momentum reservoirs generated during star formation. This accretion process produces very powerful engines able to drive the optical jets and the molecular outflows.
A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.I. Gómez de Castro, A.P. Goodson, Ana I. Gómez de Castro, B. Rekowski von, C. Ferro-Fontán, D.R. Ardila, E. Bergin, E. Bergin, E. Gullbring, F. Hamann, F. Krause, F.K. Lamb, G.J. Herczeg, G.J. Herczeg, Herczeg, Herczeg, J. Bouvier, J. Ferreira, J. Frank, J. Muzerolle, J.C. Raymond, M.V. Penston, N. Kappelmann, P. Ghosh, P. Hartigan, P.P. Petrov, S. Basu, S.A. Lamzin, T. Preibish   +40 more
core   +1 more source

Absolute Wavelength Shifts - A new diagnostic for rapidly rotating stars [PDF]

arXiv, 2003
Accuracies reached in space astrometry now permit the accurate determination of astrometric radial velocities, without any use of spectroscopy. Knowing this true stellar motion, spectral shifts intrinsic to stellar atmospheres can be identified, for instance gravitational redshifts and those caused by velocity fields on stellar surfaces.
arxiv  

An Evaluation of Equatorial Perturbation Electric Fields Using Empirical Vertical Drift Models

Space Weather, Volume 23, Issue 4, April 2025.
Abstract We examined the electrodynamic impact of four geomagnetic storms of increasing intensities on the equatorial ionosphere: a moderate storm (27–28 September 2017), a strong storm (17–18 April 2002), a severe storm (07–08 September 2017), and an extreme storm (09–10 November 2004).
Sophia R. Laranja, Marco A. Ridenti, Bela G. Fejer, J. Amorim   +3 more
wiley   +1 more source