Zobrazeno 1 - 10
of 1 913
pro vyhledávání: '"Rojas, J. P."'
We explore the meromorphic structure of the $\zeta$-function associated to the boundary eigenvalue problem of a modified Sturm-Liouville operator subject to spectral dependent boundary conditions at one end of a segment of length $l$. We find that it
Externí odkaz:
http://arxiv.org/abs/2410.20437
Autor:
Méndez-Delgado, J. E., Skillman, E. D., Aver, E., Morisset, C., Esteban, C., García-Rojas, J., Kreckel, K., Rogers, N. S. J., Rosales-Ortega, F. F., Arellano-Córdova, K. Z., Flury, S. R., Reyes-Rodríguez, E., Orte-García, M.
The physics of recombination lines (RLs) in the HeI singlet system is expected to be relatively simple, supported by accurate atomic models. We examine the intensities of HeI singlets $\lambda \lambda$3614, 3965, 5016, 6678, 7281 and the triplet HeI
Externí odkaz:
http://arxiv.org/abs/2410.17381
Autor:
Méndez-Delgado, J. E., Kreckel, K., Esteban, C., García-Rojas, J., Carigi, L., Sander, A. A. C., Palla, M., Chruślińska, M., De Looze, I., Relaño, M., van der Giessen, S. A., Reyes-Rodríguez, E., Sánchez, S. F.
Publikováno v:
A&A 690, A248 (2024)
In stars, metallicity is usually traced using Fe, while in nebulae, O serves as the preferred proxy. Both elements have different nucleosynthetic origins and are not directly comparable. Additionally, in ionized nebulae, Fe is heavily depleted onto d
Externí odkaz:
http://arxiv.org/abs/2408.06215
Autor:
Gómez-Llanos, V., García-Rojas, J., Morisset, C., Monteiro, H., Jones, D., Wesson, R., Boffin, H. M. J., Corradi, R. L. M.
Publikováno v:
A&A 689, A228 (2024)
(Abridged) The abundance discrepancy problem in planetary nebulae (PNe) has long puzzled astronomers. NGC6153, with its high Abundance Discrepancy Factor (ADF~10), provides an opportunity to understand the chemical structure and ionisation processes
Externí odkaz:
http://arxiv.org/abs/2407.06385
Autor:
Rojas, J. Maurice
Section 10.4 of the 1998 Springer-Verlag book {\em Complexity and Real Computation}, by Blum, Cucker, Shub, and Smale, contains a particularly elegant proof of the Fundamental Theorem of Algebra: The central idea of the proof naturally leads to a hom
Externí odkaz:
http://arxiv.org/abs/2406.12198
Autor:
Reyes-Rodríguez, E., Méndez-Delgado, J. E., García-Rojas, J., Binette, L., Nemer, A., Esteban, C., Kreckel, K.
Context. Carbon is the fourth most abundant element in the universe and its distribution is critical to understanding stellar evolution and nucleosynthesis. In optical studies of ionized nebulae, the only way to determine the C/H abundance is by usin
Externí odkaz:
http://arxiv.org/abs/2404.18581
Computing the isotopy type of a hypersurface, defined as the positive real zero set of a multivariate polynomial, is a challenging problem in real algebraic geometry. We focus on the case where the defining polynomial has combinatorially restricted e
Externí odkaz:
http://arxiv.org/abs/2403.08497
Autor:
Sánchez-Lavega, A., del Río-Gaztelurrutia, T., Hueso, R., Pérez-Hoyos, S., García-Melendo, E., Antuñano, A., Mendikoa, I., Rojas, J. F., Lillo, J., Barrado-Navascués, D., Gomez-Forrellad, J. M., Go, C., Peach, D., Barry, T., Milika, D. P., Nicholas, P., Wesley, A., Team, the IOPW-PVOL
Publikováno v:
Geophys. Res. Lett. (2014) 41 1425-1431
We investigate the long-term motion of Saturn's North-Pole Hexagon and the structure of its associated eastward jet, using Cassini ISS and ground-based images from 2008 to 2014. We show that both are persistent features that have survived the long po
Externí odkaz:
http://arxiv.org/abs/2402.06371
Autor:
Sánchez-Lavega, A., García-Melendo, E., Perez-Hoyos, S., Hueso, R., Wong, M. H., Simon, A., Sanz-Requena, J. F., Antuñano, A., Barrado-Izagirre, N., Garate-Lopez, I., Rojas, J. F., Gaztelurrutia, T. del Rio, Gómez-Forrellad, J. M., de Pater, I., Li, L., Barry, T., contributors, PVOL
Publikováno v:
Nature Communications, vol. 7, article number: 13626 (2016)
Saturn has an intense and broad eastward equatorial jet with a complex three-dimensional structure mixed with time variability. The equatorial region experiences strong seasonal insolation variations enhanced by ring shadowing and three of the six kn
Externí odkaz:
http://arxiv.org/abs/2401.17833
Autor:
Méndez-Delgado, J. E., Esteban, C., García-Rojas, J., Arellano-Córdova, K. Z., Kreckel, K., Gómez-Llanos, V., Egorov, O. V., Peimbert, M., Orte-García, M.
We present a first study based on the analysis of the DEep Spectra of Ionized REgions Database (DESIRED). This is a compilation of 190 high signal-to-noise ratio optical spectra of HII regions and other photoionized nebulae, mostly observed with 8-10
Externí odkaz:
http://arxiv.org/abs/2305.13136