Zobrazeno 1 - 10
of 297
pro vyhledávání: '"Toalá, J A"'
A considerable number of asymptotic giant branch (AGB) stars exhibit UV excess and/or X-ray emission indicative of the presence of a binary companion. AGB stars are so bright that they easily outshine their companions, making almost impossible their
Externí odkaz:
http://arxiv.org/abs/2411.14270
Autor:
Vásquez-Torres, D. A., Toalá, J. A., Sacchi, A., Guerrero, M. A., Tejeda, E., Karovska, M., Montez Jr, R.
Multi-epoch Chandra and XMM-Newton observations of the symbiotic system R Aquarii (R Aqr) spanning 22 yr are analysed by means of a reflection model produced by an accretion disc. This methodology helps dissecting the contribution from different comp
Externí odkaz:
http://arxiv.org/abs/2411.04935
Autor:
Santamaría, E., Toalá, J. A., Liimets, T., Guerrero, M. A., Botello, M. K., Sabin, L., Ramos-Larios, G.
We present an analysis of high-dispersion spectroscopic observations of the symbiotic system R Aquarii (R Aqr) obtained with the Manchester Echelle Spectrograph (MES) at the 2.1 m telescope of the San Pedro M\'artir Observatory (Mexico). An interpret
Externí odkaz:
http://arxiv.org/abs/2404.17710
We present the analysis of archival Very Large Telescope (VLT) MUSE and multi-epoch Hubble Space Telescope (HST) WFPC2 and WFC3/UVIS narrow-band observations of the remnant associated with the ejecta of the mid-nineteenth century outburst of the recu
Externí odkaz:
http://arxiv.org/abs/2402.07879
The acquisition of high-quality deep images of planetary nebulae (PNe) has allowed the detection of a wealth of small-scale features, which highlight the complexity of the formation history and physical processes shaping PNe. Here we present the disc
Externí odkaz:
http://arxiv.org/abs/2312.10532
Autor:
Estrada-Dorado, S., Lora, V., Toalá, J. A., Esquivel, A., Guerrero, M. A., Maldonado, R. F., Chu, Y. -H.
The emission of hard X-rays associated with white dwarfs (WD) can be generated by the presence of a stellar companion either by the companion's coronal emission or by an accretion disk formed by material stripped from the companion. Recent studies ha
Externí odkaz:
http://arxiv.org/abs/2311.12942
We present the analysis of spatially-resolved spectroscopic observations of the born-again planetary nebula (PN) A 78 that are used to investigate the chemistry and physical properties of its three main morphological components, namely the inner knot
Externí odkaz:
http://arxiv.org/abs/2309.08242
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-Newton RGS and Chandra HETG X-ray spectra allowed us to obtain reliable est
Externí odkaz:
http://arxiv.org/abs/2305.03679
Autor:
Lora, V., Toalá, J. A., González-Carbajal, J. I., Guerrero, M. A., Esquivel, A., Ramos-Larios, G.
We present the first 3D radiation-hydrodynamic simulations of the formation of planetary nebulae (PNe) emerging from 3D spiral patterns. We use the GUACHO code to create 3D spiral structures as a consequence of the distortions on the geometry of the
Externí odkaz:
http://arxiv.org/abs/2304.08668
Autor:
Estrada-Dorado, S., Guerrero, M. A., Toalá, J. A., Chu, Y. -H., Lora, V., Rodríguez-López, C.
A recent analysis of Chandra X-ray data of the metal-polluted white dwarf (WD) G29-38 has revealed X-ray emission that can be attributed to the accretion of debris from a planetary body. In the light of this detection we revisit here archival XMM-New
Externí odkaz:
http://arxiv.org/abs/2302.05028