Zobrazeno 1 - 10
of 956
pro vyhledávání: '"Toala A"'
Autor:
Guerrero, M. A., Santamaria, E., Liberato, G., Parker, Q. A., Goncalves, D. R., Rodriguez-Gonzalez, J. B., Ritter, A., Yuan, H., Toala, J. A.
The identification of the nebula HaTr 5 with the shell remnant of the historic Nova Sco 1437 around the low-accretion rate cataclysmic variable 2MASS J17022815-4306123 has been used in the framework of the hibernation scenario to set an upper limit o
Externí odkaz:
http://arxiv.org/abs/2412.12813
Autor:
Estrada-Dorado, S., Guerrero, M. A., Toalá, J. A., Maldonado, R. F., Lora, V., Vasquez-Torres, D. A., Chu, Y. -H.
The central star of the Helix Nebula, WD 2226$-$210 presents enigmatic hard X-ray emission and mid-IR excess. The latter has been attributed to a dusty disk or a cloud-like structure around WD 2226$-$210 formed from material of Kuiper Belt-like or co
Externí odkaz:
http://arxiv.org/abs/2412.07863
A considerable number of asymptotic giant branch (AGB) stars exhibit UV excess and/or X-ray emission that indicates a binary companion. AGB stars are so bright that they easily outshine their companions. This almost prevents their identification. Y G
Externí odkaz:
http://arxiv.org/abs/2411.14270
Autor:
Vásquez-Torres, D. A., Toalá, J. A., Sacchi, A., Guerrero, M. A., Tejeda, E., Karovska, M., Montez Jr, R.
Multi-epoch Chandra and XMM-Newton observations of the symbiotic system R Aquarii (R Aqr) spanning 22 yr are analysed by means of a reflection model produced by an accretion disc. This methodology helps dissecting the contribution from different comp
Externí odkaz:
http://arxiv.org/abs/2411.04935
Autor:
Tejeda, Emilio, Toalá, Jesús A.
The Bondi-Hoyle-Lyttleton (BHL) accretion model is widely used to describe how a compact object accretes material from a companion's stellar wind in binary systems. However, this classical model becomes inaccurate when the wind velocity ($v_\mathrm{w
Externí odkaz:
http://arxiv.org/abs/2411.01755
Autor:
Van de Steene, Griet, van Hoof, Peter, Kimeswenger, Stefan, Hajduk, Marcin, Tafoya, Daniel, Toala, Jesus, Zijlstra, Albert, Barria, Daniela
Optical spectra of the Very Late Thermal Pulse (VLTP) object V4334 Sgr have shown a rapidly changing spectrum resulting from shocks in the outflow, which created a new bipolar nebula inside the old nebula. We see C II and C III emission lines emergin
Externí odkaz:
http://arxiv.org/abs/2409.13289
Autor:
Hajduk, Marcin, van Hoof, Peter A. M., Zijlstra, Albert A., Van de Steene, Griet, Kimeswenger, Stefan, Barría, Daniela, Tafoya, Daniel, Toalá, Jesús A.
Publikováno v:
A&A 688, L21 (2024)
The very late thermal pulse (VLTP) affects the evolution of $\sim$20\% of 1--8\,$\mathrm M_\odot$ stars, repeating the last phases of the red giant within a few years and leading to the formation of a new, but hydrogen-poor nebula within the old plan
Externí odkaz:
http://arxiv.org/abs/2407.18020
AGB stars are not expected to be X-ray-emitters, yet a small fraction of them, the so-called X-AGBs, show X-ray emission that can be attributed to coronal activity of a companion or accretion onto it. By searching the recently released eROSITA-DE eRA
Externí odkaz:
http://arxiv.org/abs/2407.10552
Spectroscopic observations have shown for decades that the Wolf-Rayet (WR) phenomenon is ubiquitous among stars with different initial masses. Although much effort to understand the winds from massive WR stars has been presented in the literature, no
Externí odkaz:
http://arxiv.org/abs/2405.10177
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 spectra are analysed by adopting a model that includes a reflection compo
Externí odkaz:
http://arxiv.org/abs/2405.08980