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Autor:
Tegel, M., Johansson, S., Weiss, V., Schellenberg, I., Hermes, W., Poettgen, R., Johrendt, Dirk
Publikováno v:
Europhys. Lett. 2008, 84, 67007
The new quaternary iron arsenide-fluoride SrFeAsF with the tetragonal ZrCuSiAs-type structure was synthesized and the crystal structure was determined by X-ray powder diffraction (P4/nmm, a = 399.30(1), c = 895.46(1) pm). SrFeAsF undergoes a structur
Externí odkaz:
http://arxiv.org/abs/0810.2120
Autor:
Aldenius, M., Johansson, S.
The quality of astronomical spectra is now so high that the accuracy of the laboratory data is getting more and more important for the analysis and interpretation. Both in astrophysics and cosmology the needs for accurate laboratory wavelengths have
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703356
Autor:
Aldenius, M., Johansson, S.
Publikováno v:
Astron.Astrophys.467:753-760,2007
With new astronomical infrared spectrographs the demands of accurate atomic data in the infrared have increased. In this region there is a large amount of parity-forbidden lines, which are of importance in diagnostics of low-density astrophysical pla
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703145
Publikováno v:
Astron.Astrophys. 461 (2007) 767-773
The stellar abundance ratio of Mg/Fe is an important tool in diagnostics of galaxy evolution. In order to make reliable measurements of the Mg abundance of stars, it is necessary to have accurate values for the oscillator strength (f-value) of each o
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610033
Publikováno v:
Mon.Not.Roy.Astron.Soc.370:444-452,2006
The most precise method of investigating possible space-time variations of the fine-structure constant, using high-redshift quasar absorption lines, is the many-multiplet (MM) method. For reliable results this method requires very accurate relative l
Externí odkaz:
http://arxiv.org/abs/astro-ph/0605053
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:
http://arxiv.org/abs/astro-ph/0602365
The spectrum of Eta Carinae and its ejecta shows slow variations over a period of 5.5 years. However, the spectrum changes drastically on a time scale of days once every period called the 'spectral event'. We report on variations in the narrow emissi
Externí odkaz:
http://arxiv.org/abs/astro-ph/0503410
Autor:
Johansson, S., Letokhov, V. S.
Publikováno v:
New Astron. 10 (2005) 361-369
We consider the possibility of measuring the true width of the narrow Fe II optical lines observed in spectra of the Weigelt blobs in the vicinity of Eta Carinae. The lines originate as a result of stimulated amplification of spontaneous emission of
Externí odkaz:
http://arxiv.org/abs/astro-ph/0501246
Autor:
Johansson, S., Letokhov, V. S.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 364 (2005) 731-737
After the discovery of space masers based on OH radicals (Weaver et al, 1965) and H2O (Cheung et al, 1969) such microwave lasers have been found to work in more than 100 molecular species (Elitzur, 1992; Townes, 1997), as well as in highly excited H
Externí odkaz:
http://arxiv.org/abs/astro-ph/0409069