Zobrazeno 1 - 10
of 163
pro vyhledávání: '"Sveneric Johansson"'
Autor:
Vladilen Letokhov, Sveneric Johansson
Publikováno v:
New Astronomy Reviews. 51:443-523
The present state of the art concerning astrophysical lasers (APL) and nonlinear optical effects under astrophysical conditions is reviewed. The operational conditions of an APL (amplification under non-LTE conditions) and astrophysical predecessors
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::39b541775d2f70c615671c4dbb6a0b7a
https://doi.org/10.1016/j.newar.2007.03.002
https://doi.org/10.1016/j.newar.2007.03.002
Autor:
Sveneric Johansson, Vladilen Letokhov
Publikováno v:
Herald of the Russian Academy of Sciences. 77:27-31
In the course of physical research, some phenomena are first observed in a laboratory and later in the natural environment, or the reverse may be true. For example, the thermonuclear fusion of light nuclei was first discovered in the interior of star
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c16abc4470810948af9353310ea47e87
https://doi.org/10.1134/s1019331607010054
https://doi.org/10.1134/s1019331607010054
Publikováno v:
Astronomy & Astrophysics. 456:1181-1185
Using the Fourier Transform Spectrometer at Lund Observatory, intensity calibrated spectra of singly ionized zirconium have been recorded and analyzed. Oscillator strengths for 263 Zr II spectral lines in the region 2500-5400 angstrom have been deriv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dec7c83aa03abcbb8934c448761878e7
https://doi.org/10.1051/0004-6361:20065212
https://doi.org/10.1051/0004-6361:20065212
Publikováno v:
Astronomy & Astrophysics. 452:253-256
The Si III] 1892A intercombination line shows an anomalously high intensity in spectra of the radiation-rich Weigelt blobs in the vicinity of Eta Carinae. The line disappears during the 100 days long spectral events occurring every 5.5 years. The aim
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::63fd9962763ca28e6d4fcc3a39209c96
https://doi.org/10.1051/0004-6361:20054375
https://doi.org/10.1051/0004-6361:20054375
Publikováno v:
Astronomy & Astrophysics. 451:157-175
A detailed study of ultraviolet spectra of the symbiotic star AG Peg has been undertaken to derive the atomic excitation mechanisms and origin of formation for the lines common in symbiotic systems. More than 600 emission lines are observed in spectr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c86238535e1f00a726d2e0311d18ab20
https://doi.org/10.1051/0004-6361:20053396
https://doi.org/10.1051/0004-6361:20053396
Autor:
Sveneric Johansson, Vladilen Letokhov
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 364:731-737
Within the framework of a simple model of photophysical processes in the Weigelt blobs in the vicinity of the luminous blue variable (LBV) star eta Carinae, we explain the presence of the fluorescent 8446-angstrom and forbidden [O I] 6300-angstrom li
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::51da05ecbd8406318f78ac50f605c545
https://doi.org/10.1111/j.1365-2966.2005.09605.x
https://doi.org/10.1111/j.1365-2966.2005.09605.x
Autor:
Sveneric Johansson, Steven R. Federman, Glenn M. Wahlgren, Saul J. Adelman, Emile Biémont, Steve R. Federman, Jim Lawler, Michael Mickelson, Donald Morton, Tanya Ryabchikova, Peter L. Smith, Chantal Stehle
Publikováno v:
Proceedings of the International Astronomical Union. 1:337-375
This triennial report from Comm. 14 covers the topics Atomic Spectra and Wave-length Standards, Atomic Transition Probabilities, Collision Processes, and Line Broadening.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::318dc65c4bc55fba46f33e50e1eda35f
https://doi.org/10.1017/s1743921306004807
https://doi.org/10.1017/s1743921306004807
Autor:
Lars-Olov Norlin, Hans Lundberg, D Rostohar, P. Lundin, P. Schef, A. Ellmann, Sven Mannervik, Henrik Hartman, Sveneric Johansson, Peder Royen
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 361:206-210
In the spectrum of an emission-line region ejected from the massive star Eta Carinae, called the strontium filament (SrF), forbidden lines from many elements, in particular [Sr II] and [Ti II], are observed. These lines are strong in this specific re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c282919ab119a6bae62398e6fdb4bfa9
https://doi.org/10.1111/j.1365-2966.2005.09157.x
https://doi.org/10.1111/j.1365-2966.2005.09157.x
Publikováno v:
Astronomy & Astrophysics. 435:183-189
Spectroscopy with the high spatial resolution of the Hubble Space Telescope (HST) reveals narrow absorption in the hydrogen Balmer lines in spectra of Eta Carinae and the nearby nebular-scattered starlight. While hydrogen Balmer absorption lines are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e470fcd0ad9f663b93d2d961815edbab
https://doi.org/10.1051/0004-6361:20041193
https://doi.org/10.1051/0004-6361:20041193
Autor:
Mattias Eriksson, Hans Veenhuizen, Ulisse Munari, Sveneric Johansson, Glenn M. Wahlgren, Alessandro Siviero
Publikováno v:
Astronomy & Astrophysics. 434:397-404
We present a semi-empirical equation for prediction of the strengths of those N III lines that are generated by the Bowen mechanism and observed in spectra of symbiotic stars. The equation assumes that the Bowen mechanism is the only source populatin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1914d7d7afaa91995c0f79b584469628
https://doi.org/10.1051/0004-6361:20042174
https://doi.org/10.1051/0004-6361:20042174