Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Bautista, Manuel"'
Autor:
Bautista, Manuel A., Bergemann, Maria, Gallego, Helena Carvajal, Gamrath, Sébastien, Palmeri, Patrick, Quinet, Pascal
Publikováno v:
A&A 665, A18 (2022)
Our recent re-analysis of the solar photospheric spectra with non-local thermodynamic equilibrium (non-LTE) models resulted in higher metal abundances compared to previous works. When applying the new chemical abundances to Standard Solar Model calcu
Externí odkaz:
http://arxiv.org/abs/2206.14095
Autor:
Magg, Ekaterina, Bergemann, Maria, Serenelli, Aldo, Bautista, Manuel, Plez, Bertrand, Heiter, Ulrike, Gerber, Jeffrey M., Ludwig, Hans-Günter, Basu, Sarbani, Ferguson, Jason W., Gallego, Helena Carvajal, Gamrath, Sébastien, Palmeri, Patrick, Quinet, Pascal
Publikováno v:
A&A 661, A140 (2022)
The chemical composition of the Sun is requested in the context of various studies in astrophysics, among them in the calculation of the standard solar models (SSMs), which describe the evolution of the Sun from the pre-main-sequence to its present a
Externí odkaz:
http://arxiv.org/abs/2203.02255
Autor:
Bergemann, Maria, Hoppe, Richard, Semenova, Ekaterina, Carlsson, Mats, Yakovleva, Svetlana A., Voronov, Yaroslav V., Bautista, Manuel, Nemer, Ahmad, Belyaev, Andrey K., Leenaarts, Jorrit, Mashonkina, Lyudmila, Reiners, Ansgar, Ellwarth, Monika
Motivated by the controversy over the surface metallicity of the Sun, we present a re-analysis of the solar photospheric oxygen (O) abundance. New atomic models of O and Ni are used to perform Non-Local Thermodynamic Equilibrium (NLTE) calculations w
Externí odkaz:
http://arxiv.org/abs/2109.01143
Autor:
Bergemann, Maria, Gallagher, Andrew J., Eitner, Philipp, Bautista, Manuel, Collet, Remo, Yakovleva, Svetlana A., Mayriedl, Anja, Plez, Bertrand, Carlsson, Mats, Leenaarts, Jorrit, Belyaev, Andrey K., Hansen, Camilla
Manganese (Mn) is a key Fe-group elements, commonly employed in stellar population and nucleosynthesis studies to explore the role of SN Ia. We have developed a new non-local thermodynamic equilibrium (NLTE) model of Mn, including new photo-ionisatio
Externí odkaz:
http://arxiv.org/abs/1905.05200
Autor:
Bautista, Manuel A., Ahmed, Ehab E.
A prevailing open problem in planetary nebulae research, and photoionized gaseous nebulae research at large, is the systematic discrepancies in electron temperatures and ionic abundances as derived from recombination and collisionally excited lines.
Externí odkaz:
http://arxiv.org/abs/1808.03671
Autor:
Prieto, Carlos Allende, Koesterke, Lars, Hubeny, Ivan, Bautista, Manuel A., Barklem, Paul S., Nahar, Sultana N.
Publikováno v:
A&A 618, A25 (2018)
Models of stellar spectra are necessary for interpreting light from individual stars, planets, integrated stellar populations, nebulae, and the interstellar medium. We provide a comprehensive and homogeneous collection of synthetic spectra for a wide
Externí odkaz:
http://arxiv.org/abs/1807.06049
Autor:
Madonna, Simone, Bautista, Manuel A., Dinerstein, Harriet, Sterling, Nicholas C., García-Rojas, Jorge, Kaplan, Kyle F., Rubio-Díez, Maria Del Mar, Castro-Rodríguez, Nieves, Garzón, Francisco
We have identified two new near-infrared emission lines in the spectra of planetary nebulae (PNe) arising from heavy elements produced by neutron capture reactions: [Te III] 2.1019 $\mu$m and [Br V] 1.6429 $\mu$m. [Te III] was detected in both NGC 70
Externí odkaz:
http://arxiv.org/abs/1806.05458
Autor:
Bautista, Manuel A., Ahmed, Ehab E.
A present prevailing open problem planetary nebulae research, and photoionized gaseous nebulae research at large, is the systematic discrepancies in ionic abundances derived from recombination and collisionally excited lines in many H II regions and
Externí odkaz:
http://arxiv.org/abs/1709.07945
We identify [Rb IV] 1.5973 and [Cd IV] 1.7204 micron emission lines in high-resolution (R=40,000) near-infrared spectra of the planetary nebulae (PNe) NGC 7027 and IC 5117, obtained with the IGRINS spectrometer on the 2.7-m telescope at McDonald Obse
Externí odkaz:
http://arxiv.org/abs/1602.03188
We present new atomic data (radiative transitions rates and collision strengths) from large scale calculations and a non-LTE spectral model for Fe III. This model is in very good agreement with observed astronomical emission spectra, in contrast with
Externí odkaz:
http://arxiv.org/abs/1007.1960