Zobrazeno 1 - 10
of 84
pro vyhledávání: '"van Hoof, Peter"'
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
We announce the C23.01 update of Cloudy. This corrects a simple coding error, present since $\sim$ 1990, in one routine that required a conversion from the line-center to the mean normalization of the Ly$\alpha$ optical depth. This affects the destru
Externí odkaz:
http://arxiv.org/abs/2311.10163
Autor:
Wesson, R., Matsuura, Mikako, Zijlstra, Albert A., Volk, Kevin, Kavanagh, Patrick J., García-Segura, Guillermo, McDonald, I., Sahai, Raghvendra, Barlow, M. J., Cox, Nick L. J., Bernard-Salas, Jeronimo, Aleman, Isabel, Cami, Jan, Clark, Nicholas, Dinerstein, Harriet L., Justtanont, K., Kaplan, Kyle F., Manchado, A., Peeters, Els, Van de Steene, Griet C., van Hoof, Peter A. M.
We present JWST images of the well-known planetary nebula NGC 6720 (the Ring Nebula), covering wavelengths from 1.6$\mu$m to 25 $\mu$m. The bright shell is strongly fragmented with some 20 000 dense globules, bright in H$_2$, with a characteristic di
Externí odkaz:
http://arxiv.org/abs/2308.09027
Autor:
Tafoya, Daniel, van Hoof, Peter A. M., Toala, Jesus A., Van de Steene, Griet, Randall, Suzanna, Unnikrishnan, Ramlal, Kimeswenger, Stefan, Hajduk, Marcin, Barria, Daniela, Zijlstra, Albert
We present high angular-resolution observations of Sakurai's object using the Atacama Large Millimeter Array, shedding new light on its morpho-kinematical structure. The millimetre continuum emission, observed at an angular resolution of 20 milliarcs
Externí odkaz:
http://arxiv.org/abs/2308.08962
Autor:
Chatzikos, Marios, Bianchi, Stefano, Camilloni, Francesco, Chakraborty, Priyanka, Gunasekera, Chamani M., Guzmán, Francisco, Milby, Jonathan S., Sarkar, Arnab, Shaw, Gargi, van Hoof, Peter A. M., Ferland, Gary J.
We describe the 2023 release of the spectral synthesis code Cloudy. Since the previous major release, migrations of our online services motivated us to adopt git as our version control system. This change alone led us to adopt an annual release schem
Externí odkaz:
http://arxiv.org/abs/2308.06396
Autor:
Reichel, Martin, Kimeswenger, Stefan, van Hoof, Peter A. M., Zijlstra, Albert A., Barria, Daniela, Hajduk, Marcin, Van de Steene, Griet C., Tafoya, Daniel
After becoming ionized, low-density astrophysical plasmas will begin a process of slow recombination. Models for this still have significant uncertainties. The recombination cannot normally be observed in isolation, because the ionization follows the
Externí odkaz:
http://arxiv.org/abs/2209.03634
Autor:
Tafoya, Daniel, Toalá, Jesús A., Unnikrishnan, Ramlal, Vlemmings, Wouter H. T., Guerrero, Martín A., Kimeswenger, Stefan, van Hoof, Peter A. M., Zapata, Luis A., Treviño-Morales, Sandra P., Rodríguez-González, Janis B.
Born-again stars allow probing stellar evolution in human timescales and provide the most promising path for the formation of hydrogen-deficient post-asymptotic giant branch objects, but their cold and molecular components remain poorly explored. Her
Externí odkaz:
http://arxiv.org/abs/2201.04110
Autor:
Hajduk, Marcin, Todt, Helge, Hamann, Wolf-Rainer, Borek, Karolina, van Hoof, Peter A. M., Zijlstra, Albert A.
Publikováno v:
2020, Volume 498, pp. 1205-1220
SwSt 1 (PN G001.5-06.7) is a bright and compact planetary nebula containing a late [WC]-type central star. Previous studies suggested that the nebular and stellar lines are slowly changing with time. We studied new and archival optical and ultraviole
Externí odkaz:
http://arxiv.org/abs/2009.14616
Autor:
Hajduk, Marcin, van Hoof, Peter A. M., Śniadkowska, Karolina, Krankowski, Andrzej, Błaszkiewicz, Leszek, Dąbrowski, Bartosz, Zijlstra, Albert A.
Radio continuum observations trace thermal emission of ionized plasma in planetary nebulae and bring useful information on nebular geometries. A model of homogeneous sphere or shell cannot fit the nebular spectra and brightness temperatures. Two alte
Externí odkaz:
http://arxiv.org/abs/1807.01055