Results 21 to 30 of about 35,438 (198)
Braking down an accreting protostar: disc-locking, disc winds, stellar winds, X-winds and Magnetospheric Ejecta [PDF]
, 2013 Classical T Tauri stars are low mass young forming stars that are surrounded by a circumstellar accretion disc from which they gain mass. Despite this accretion and their own contraction that should both lead to their spin up, these stars seem to ...
Ferreira, Jonathan
core +1 more source
Theory of Stellar and Extragalactic Jets [PDF]
International Astronomical Union Colloquium, 1986 AbstractDifferent types of astrophysical jets are briefly described and the wide differences in their observed properties are emphasized. Various physical mechanisms that have been proposed for creating jets, based on gas dynamical, magnetic, and radiative stresses are briefly reviewed. It is argued that magnetic fields are probably generally important
openaire +2 more sources
Diagnostics of inhomogeneous stellar jets [PDF]
Astronomy & Astrophysics, 2008 CONTEXT: In the interpretation of stellar jet observations, the physical parameters are usually determined from emission line ratios, obtained from spectroscopic observations or using the information contained in narrow band images. The basic hypothesis in the interpretation of the observations is that the emitting region is homogeneous along the line ...
De Colle, F., del Burgo, C., Raga, A. C.
openaire +2 more sources
The Angular Momenta of Neutron Stars and Black Holes as a Window on Supernovae [PDF]
, 2011 It is now clear that a subset of supernovae display evidence for jets and are observed as gamma-ray bursts. The angular momentum distribution of massive stellar endpoints provides a rare means of constraining the nature of the central engine in core ...
Miller, J. M. +2 more
core +1 more source
Steady, partially ionized stellar jets
The Astrophysical Journal, 1990 Un modele de jet stellaire stationnaire a symetrie cylindrique non-adiabatique de nombre de Mach eleve, qui inclut les effets de l'ionisation hors-equilibre et du refroidissement, est developpe. Les caracteristiques generales de ces jets sont decrites et leurs implications pour l'interpretation des jets observes analysees.
Alejandro C. Raga +2 more
openaire +1 more source
Hypersonic jets in astrophysical conditions: focus on spreading and asymmetric stability properties
New Journal of Physics, 2014 High Mach number jets emanating from young stars show remarkable collimation, low opening angle and resilience against the growth of instabilities, especially the asymmetric ones. In recent laboratory experiments instances of asymmetric three-dimensional
M Belan +4 more
doaj +1 more source
Stellar molecular jets traced by maser emission [PDF]
, 2007 Highly collimated jets found in AGB and post-AGB stars are expected to play an important role for shaping planetary nebulae. Recent VLBI observations of H2O maser sources have revealed that some of the spatio-kinematical structures of H2O maser sources ...
Baud +9 more
core +1 more source
Bubbles in Planetary Nebulae and Clusters of Galaxies: Jet Bending
, 2006 We study the bending of jets in binary stellar systems. A compact companion accretes mass from the slow wind of the mass-losing primary star, forms an accretion disk, and blows two opposite jets. These fast jets are bent by the slow wind.
Bisker, Gili, Soker, Noam
core +1 more source
Numerical simulations of stellar jets and comparison between synthetic and observed maps: clues to the launch mechanism [PDF]
, 2014 High angular resolution spectra obtained with the Hubble Space Telescope Imaging Spectrograph (HST/STIS) provide rich morphological and kinematical information about the stellar jet phenomenon, which allows us to test theoretical models efficiently.
Bacciotti, Francesca +4 more
core +3 more sources
Two-flow magnetohydrodynamical jets around young stellar objects [PDF]
Astrophysics and Space Science, 2007 We present the first-ever simulations of non-ideal magnetohydrodynamical (MHD) stellar winds coupled with disc-driven jets where the resistive and viscous accretion disc is self-consistently described. The transmagnetosonic, collimated MHD outflows are investigated numerically using the VAC code.
Casse, F., Meliani, Z., Sauty, C.
openaire +4 more sources