Zobrazeno 1 - 10
of 145
pro vyhledávání: '"Miranda, Luis F."'
Autor:
Cala, Roldán A., Gómez, José F., Miranda, Luis F., Imai, Hiroshi, de Gregorio-Monsalvo, Itziar, Mitrea, Florin Placinta, Osorio, Mayra, Anglada, Guillem
Maser emission of SiO, H$_2$O and, OH is widespread in Asymptotic Giant Branch (AGB) stars with oxygen(O)-rich envelopes. This emission quickly disappear during the post-AGB phase and is extremely rare in planetary nebulae (PN). So far, only eight PN
Externí odkaz:
http://arxiv.org/abs/2410.22785
Autor:
Cala, Roldán A., Miranda, Luis F., Gómez, José F., Morisset, Christophe, Soto, Federico, Guillén, Pedro F., Vázquez, Roberto
IRAS 22568+6141 has been classified as a low-ionisation planetary nebula (PN) and presents non-thermal radio continuum emission, which could be a signature of nascent PNe. We present intermediate-resolution long-slit spectra obtained in 2021 and 2023
Externí odkaz:
http://arxiv.org/abs/2410.16786
Autor:
Cala, Roldán A., Gómez, José F., Miranda, Luis F., Uscanga, Lucero, Breen, Shari L., Dawson, Joanne R., de Gregorio-Monsalvo, Itziar, Imai, Hiroshi, Qiao, Hai-Hua, Suárez, Olga
The evolution of asymptotic giant branch stars from the spherical symmetry into the diverse shapes of planetary nebulae (PNe) is a topic of intensive research. Young PNe provide a unique opportunity to characterize the onset of this transitional phas
Externí odkaz:
http://arxiv.org/abs/2208.09199
Publikováno v:
A&A 657, L9 (2022)
IC\,4997 is a planetary nebula well known by its variability. We present high-resolution spectra of IC\,4997 obtained in 1993, 2019, and 2020 that reveal changes in the H$\alpha$ and [N\,{\sc ii}] emission line profiles, which had never been reported
Externí odkaz:
http://arxiv.org/abs/2112.13607
Akademický článek
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Autor:
Orosz, Gabor, Gomez, Jose F., Imai, Hiroshi, Tafoya, Daniel, Torrelles, Jose M., Burns, Ross A., Frau, Pau, Guerrero, Martin A., Miranda, Luis F., Perez-Torres, Miguel A., Ramos-Larios, Gerardo, Rizzo, J. Ricardo, Suarez, Olga, Uscanga, Lucero
Publikováno v:
MNRAS Letters (2019), 482, L40-L45
Water fountains are evolved stars showing early stages of collimated mass loss during transition from the asymptotic giant branch, providing valuable insight into the formation of asymmetric planetary nebulae. We report the results of multi-epoch VLB
Externí odkaz:
http://arxiv.org/abs/1809.07505
Autor:
Guerrero, Martin A., Fang, Xuan, Bertolami, Marcelo M. Miller, Ramos-Larios, Gerardo, Todt, Helge, Alarie, Alexandre, Sabin, Laurence, Miranda, Luis F., Morisset, Christophe, Kehrig, Carolina, Zavala, Saul A.
Planetary nebulae are ionized clouds of gas formed by the hydrogen-rich envelopes of low- and intermediate-mass stars ejected at late evolutionary stages. The strong UV flux from their central stars causes a highly stratified ionization structure, wi
Externí odkaz:
http://arxiv.org/abs/1808.03462
Autor:
Gomez, Jose F., Niccolini, Gilles, Suarez, Olga, Miranda, Luis F., Rizzo, J. Ricardo, Uscanga, Lucero, Green, James A., de Gregorio-Monsalvo, Itziar
We present continuum and molecular line (CO, C$^{18}$O, HCO$^+$) observations carried out with the Atacama Large Millimeter/submillimeter Array toward the "water fountain" star IRAS 15103-5754, an object that could be the youngest PN known. We detect
Externí odkaz:
http://arxiv.org/abs/1808.03681
Autor:
Martins, Joao Francisco B. S., Oliveira, Luiz Otavio V. B., Miranda, Luis F., Casadei, Felipe, Pappa, Gisele L.
Advances in Geometric Semantic Genetic Programming (GSGP) have shown that this variant of Genetic Programming (GP) reaches better results than its predecessor for supervised machine learning problems, particularly in the task of symbolic regression.
Externí odkaz:
http://arxiv.org/abs/1804.06808
Autor:
Miranda, Luis F., Oliveira, Luiz Otavio V. B., Martins, Joao Francisco B. S., Pappa, Gisele L.
Noise is a consequence of acquiring and pre-processing data from the environment, and shows fluctuations from different sources---e.g., from sensors, signal processing technology or even human error. As a machine learning technique, Genetic Programmi
Externí odkaz:
http://arxiv.org/abs/1707.01046