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Accretion in Binary Systems with Slow Stellar Winds
Jesús A. Toalá, Emilio Tejeda, Raúl F. Maldonado +1
Wind accretion in binary systems is commonly described using the Bondi-Hoyle-Lyttleton (BHL) formalism. However, its standard implementation fails in the slow-wind regime, where th…
The Influence of the Accretion Disc Structure on X-ray Spectral States in Symbiotic Binaries
Jesús A. Toalá, Diego A. Vasquez-Torres
Symbiotic stars are binary systems where a white dwarf (WD) accretes material from the wind of an evolved, late-type companion. X-ray-emitting symbiotic systems are classified into…
Tiānguān ( Tau) as a binary system consisting of a Be-star and an accreting White Dwarf: opening a gate to understanding enigmatic Cas analogues
Jesús A. Toalá, Lidia M. Oskinova, Diego A. Vasquez-Torres
The analogues of Cassiopea are binary early type Be stars which are X-ray bright with hard thermal spectra. The nature of companions in these stars and mechanisms of their X-ra…
Geometric correction for wind accretion in binary systems
Emilio Tejeda, Jesús A. Toalá
The Bondi-Hoyle-Lyttleton (BHL) accretion model is widely used to describe how a compact object accretes material from a companion's stellar wind in binary systems. However, its st…
The X-ray rise and fall of the Recurrent Symbiotic System T CrB
Jesús A. Toalá, Omaira González-Martín, Andrea Sacchi +1
We present the analysis of publicly available NuSTAR, Suzaku and XMM-Newton observations of the symbiotic recurrent nova T CrB covering the 2006.77-2022.66 yr period. The X-ray spe…
Reflection physics in X-ray-emitting Symbiotic Stars
Jesús A. Toalá
X-ray-emitting symbiotic stars exhibit a variety of spectral shapes classified as , , , and / types, which have been attributed to different phenomena such as th…
A comprehensive hydrodynamical study of SB DEM L50: understanding off-centre SNe and soft X-ray luminosity
Rogelio Orozco-Duarte, Guillermo García-Segura, Aida Wofford +1
The superbubbles (SBs) carved in the interstellar medium by stellar winds and supernovae (SNe) are filled with hot (10~K) gas that produces soft X-ray emission (0.3-2.0\,…
Peering into the central region of a nano-quasar: XMM-Newton and Chandra views of the CH Cyg Symbiotic System
J. A. Toalá, O. González-Martín, M. Karovska +3
We present the analysis of archival XMM-Newton and Chandra observations of CH Cyg, one of the most studied symbiotic stars (SySts). The combination of the high-resolution XMM-Newto…
And then they were two: detection of non-thermal radio emission from the bow shocks of two runaway stars
M. Moutzouri, J. Mackey, C. Carrasco González +7
Winds from massive stars have recently been deemed promising sites for investigating relativistic particle acceleration. Particularly, the resulting bow shock from the interaction…
On the apparent absence of WR+NS systems: the curious case of WR124
J. A. Toala, L. M. Oskinova, W. -R. Hamann +8
Among different types of massive stars in advanced evolutionary stages is the enigmatic WN8h type. There are only a few Wolf-Rayet (WR) stars with this spectral type in our Galaxy.…
On the Absence of Non-thermal X-ray emission around Runaway O stars
J. A. Toalá, L. M. Oskinova, R. Ignace
Theoretical models predict that the compressed interstellar medium around runaway O stars can produce high-energy non-thermal diffuse emission, in particular, non-thermal X-ray and…
X-ray Observations of Bow Shocks around Runaway O Stars. The case of Oph and BD+433654
J. A. Toalá, L. M. Oskinova, A. González-Galán +3
Non-thermal radiation has been predicted within bow shocks around runaway stars by recent theoretical works. We present X-ray observations towards the runaway stars Oph (Chandr…
Diffuse X-ray Emission within Wolf-Rayet Nebulae
J. A. Toalá, M. A. Guerrero, Y. -H. Chu +2
We discuss our most recent findings on the diffuse X-ray emission from Wolf-Rayet (WR) nebulae. The best-quality X-ray observations of these objects are those performed by XMM-Newt…