Perez-Rendon, B., Garcia-Segura, G., Langer, N.
Multi wavelength observations of Cassiopeia A (Cas A) have provided us with a strong evidence for the presence of circumstellar material surrounding the progenitor star. It has been suggested that...
Hydrodynamical Velocity Fields in Planetary Nebulae (2008)
Steffen, W., Garcia-Segura, G., Koning, N.
Based on axi-symmetric hydrodynamical simulations and 3D reconstructions with Shape, we investigate the kinematic signatures of deviations from homologous ("Hubble-type") outflows in some typical...
Multiple ring nebulae around blue supergiants (2008)
Chita, S. M., Langer, N., Van Marle, A. J., Garcia-Segura, G., Heger, A.
In the course of the life of a massive star, wind-wind interaction can give rise to the formation of circumstellar nebulae which are both predicted and observed in the nature. We present generic...
Garcia-Diaz, M. T., López, J. A., Garcia-Segura, G., Richer, M. G., Steffen, W.
The central star of this nebula has an observed intense magnetic field and the fast wind is no longer present, indicating that a back flow process has probably developed. Long-slit, spatially...
Schure, K.M., Vink, J., Garcia-Segura, G., Achterberg, A.
We present hydrodynamical models for the Cassiopeia A (Cas A) supernova remnant and its observed jet/counterjet system. We include the evolution of the progenitor's circumstellar medium, which is...
Van Marle, A. J., Langer, N., Garcia-Segura, G.
Van Marle et al. (2005) showed that circumstellar absorption lines in early Type Ib/c supernova and gamma-ray burst afterglow spectra may reveal the progenitor evolution of the exploding Wolf-Rayet...
Models for the circumstellar medium of long gamma-ray burst progenitor candidates (2006)
Van Marle, A. J., Langer, N., Achterberg, A., Garcia-Segura, G.
We present hydrodynamical models of circumstellar medium (CSM) of long gamma-ray burst (GRB) progenitor candidates. These are massive stars that have lost a large amount of mass in the form of...
The Dynamical Evolution of Planetary Nebulae After the Fast Wind (2006)
Garcia-Segura, G., Lopez, J. A., Steffen, W., Meaburn, J., Manchado, A.
In this paper we explore the dynamics of ionization bounded planetary nebulae after the termination of the fast stellar wind. When the stellar wind becomes negligible, the hot, shocked bubble...
Forming a constant density medium close to long gamma-ray bursts (2006)
Van Marle, A. J., Langer, N., Achterberg, A., Garcia-Segura, G.
The progenitor stars of long Gamma-Ray Bursts (GRBs) are thought to be Wolf-Rayet stars, which generate a massive and energetic wind. Nevertheless, about 25 percent of all GRB afterglows light curves...
Evolution of the Circumstellar Medium around a Gamma-Ray Burst Progenitor (2006)
Marle, A.J. Van, Langer, N., Yoon, S.C., Garcia-Segura, G.
We present the results of hydrodynamical simulations of the circumstellarmedium around a Gamma-ray burst progenitor. We use the mass loss history ofa rapidly rotating, low metallicity massive star as...
Ambient Interstellar Pressure and Superbubble Evolution (2004)
High ambient interstellar pressure is suggested as a possible factor to explain the ubiquitous observed growth-rate discrepancy for supernova-driven superbubbles and stellar wind bubbles. Pressures...
Hot Gas in the Circumstellar Bubble S308 (2003)
Guerrero, M. A., Gruendl, R. A., Garcia-Segura, G., Wendker, H. J.
S308 is a circumstellar bubble blown by the WN4 star HD50896. It is one of the only two single-star bubbles that show detectable diffuse X-ray emission. We have obtained XMM-Newton EPIC observations...
G. Garcia-Segura, J. A. Lopez, J. Franco
This paper provides solutions for the origin of post-AGB winds, their acceleration up to high speed, and the subsequent formation of extremely collimated proto-planetary nebulae. Several wind models...
The Formation of Collimated Outflows and Concentric Rings in Magnetized Planetary Nebulae (2002)
J. Franco, G. Garcia-Segura, J. A. Lopez, S. Kurtz
Magnetic fields and wind asymmetries from rotating stars, along with precession of the stellar rotation axis, can create most of the observed Planetary Nebulae morphologies and collimated outflows...
Villaver, E., Manchado, A., Garcia-Segura, G.
Multiple shell planetary nebulae (MSPNe) are most likely a consequence of the modulation of the mass-loss rate during the thermal pulses on the AGB. By using numerical simulations of their formation,...
Interactions of Massive Stars with Their Parental Clouds (1996)
Franco, J., Garcia-Segura, G., Plewa, T.
Here we discuss the interaction of massive stars with their parental molecular clouds. A summary of the dynamical evolution of HII regions and wind-driven bubbles in high-pressure cloud cores is...
The State of the Gas Around Young Stellar Groups (1996)
Franco, J., Plewa, T., Garcia-Segura, G.
We present the main features in the evolution of the gas pressure in star forming regions, from the formation of the parental cloud to the moment when the region is pressurized by interacting stellar...