Results 31 to 40 of about 1,628,489 (254)

Hydrogen Line Profiles [PDF]

Highlights of Astronomy, 1995
Observed hydrogen line profiles are an enormously important source of diagnostic information about virtually all kinds of astronomical bodies. Therefore, it is important to understand the hydrogen line formation in sufficient detail to be able to achieve a high degree of reliability by analyzing observed hydrogen line profiles.Calculation of the ...
openaire   +1 more source

Line-profile variability of EZ CMa [PDF]

Symposium - International Astronomical Union, 1995
CCD spectra for the unusual Wolf-Rayet star EZ CMa (WR6) are presented. The analysis of the profile changes of HeII lines shows a correlation between the gravity center of the line and the skewness (Robert et al. 1992). The fourth moment (kurtosis) changes with phase and looks epoch independent.
L. Georgiev, M. M. Ivanov
openaire   +1 more source

Data on Stark Broadening of N VI Spectral Lines

Data
Data on Stark broadening parameters, spectral line widths, and shifts for 15 multiplets of N VI, whose spectral lines are broadened by collisions with electrons, protons, alpha particles (He III) and B III, B IV, B V and B VI ions, are presented.
Milan S. Dimitrijević, Magdalena D. Christova, Sylvie Sahal-Bréchot   +2 more
doaj   +1 more source

Detailed Investigation of the Electric Discharge Plasma between Copper Electrodes Immersed into Water

Atoms, 2017
A phenomenological picture of pulsed electrical discharge in water is produced by combining electrical, spectroscopic, and imaging methods. The discharge is generated by applying ~350 μs long 100 to 220 V pulses (values of current from 400 to 1000 A ...
Roman Venger, Tetiana Tmenova, Flavien Valensi, Anatoly Veklich, Yann Cressault, Viacheslav Boretskij   +5 more
doaj   +1 more source

Global Collapses and Expansions in Star-Forming Clouds

, 2009
Spectral molecular line profile observations of star-forming molecular clouds sometimes show distinct red asymmetric double-peaked molecular line profiles with weaker blue peaks and stronger red peaks.
Adams, Adelson, Aguti, Arons, Belloche, Bernes, Bian, Carolan, Di Francesco, Evans, Fiege, Fiege, Fuller, Gao, Hammersley, Harvey, Hennebelle, Hogerheijde, Hu, Jørgensen, Kenyon, Keto, Lada, Larson, Lee, Lou, Lou, Lou, Lou, MacLow, Mardones, Matthews, Matzner, Matzner, McKee, Moraghan, Moriarty-Schieven, Myers, Myers, Nakano, Ossenkopf, Ostriker, Park, Park, Park, Rawlings, Redman, Redman, Saito, Schöier, Shang, Shen, Shirley, Shreider, Shu, Shu, Shu, Shu, Su, Tafalla, Tafalla, Tafalla, Thompson, Tsamis, van der Tak, Van Zadelhoff, Velusamy, Wang, Ward-Thompson, Wilner, Wu, Yang Gao, Yu, Yu, Yu-Qing Lou, Zhou, Zhou, Zweibel   +77 more
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Spectral line profile of turbulent gas [PDF]

Applied Optics, 1986
A simple theoretical model is proposed to determine the spectral line profile of a turbulent gas. It is shown that the spectral line profile of a turbulent gas is still a Voigt profile. Its Lorentzian component is hardly influenced by the turbulent motion.
G, Zhi, J, Qian
openaire   +2 more sources

Kinematical structure of the circumstellar environments of galactic B[e]-type stars

, 2003
High resolution line profiles are presented for selected forbidden and permitted emission lines of a sample of galactic B[e]-type stars. The spectral resolution corresponds to 5-7 km/s with the exception of some line profiles which were observed with a ...
Acker, Allen, Allen, Andrillat, Andrillat, Andrillat, Appenzeller, Beals, Beals, Beck, Brand, Brugel, Butler, Böhm, Carlson, Chamberlain, Cidale, Clark, de Freitas Pacheco, de Winter, Dekker, Drew, Edwards, Esteban, F.-J. Zickgraf, Finkenzeller, Frontera, Hamann, Hamann, Hartmann, Henize, Herbig, Hofmann, Israelian, Israelian, Jaschek, Jaschek, Lamers, Lamers, Le Bertre, Leibowitz, Leinert, Magalhaes, McGregor, Mihalas, Miroshnichenko, Miroshnichenko, Miroshnichenko, Orr, Oudmaijer, Oudmaijer, Parthasarathy, Pfeiffer, Pöllitsch, Schulte-Ladbeck, Sharpless, Surdej, Swings, Swings, Swings, Swings, Swings, Swings, Thé, Viotti, Waters, White, Winkler, Wolf, Zickgraf, Zickgraf, Zickgraf, Zickgraf, Zickgraf, Zickgraf, Zickgraf   +75 more
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Regularities and Systematic Trends on Zr IV Stark Widths

Atoms, 2017
Regularities and systematic trends among the Stark widths of 18 Zr IV spectral lines obtained by modified semiempirical approach have been discussed. Also we compared those calculated Stark broadening parameters with estimates according to Cowley, Purić ...
Zlatko Majlinger, Milan S. Dimitrijević, Zoran Simić   +2 more
doaj   +1 more source

CAII lines in a quiet region on the Sun I. Dynamic processes in the solar atmosphere

Solar-Terrestrial Physics, 2023
We have studied oscillation processes in the quiet Sun outside a coronal hole at different levels of the solar chromosphere. The study was based on spectroscopic observations of ionized calcium lines (K, H, and 849.8 nm) obtained by the Sayan Solar ...
Turova I. P., Grigoryeva S. A., Ozhogina O. A.   +2 more
doaj   +1 more source

Alkali Line Profiles in Degenerate Dwarfs

, 2007
Ultracool stellar atmospheres show absorption by alkali resonance lines severely broadened by collisions with neutral perturbers. In the coolest and densest atmospheres, such as those of T dwarfs, Na I and K I broadened by molecular hydrogen and helium ...
Derek Homeier, France Allard, Luka Č. Popović, Milan S. Dimitrijević, Nicole Allard   +4 more
core   +1 more source