Results 281 to 290 of about 35,694,720 (305)

Variation of the Hβ Emission Lines of YY Geminorum

Publications of the Astronomical Society of Japan, 1980
Abstract Forty-four image-tube spectra of YY Gem (4 Å mm−1, λλ 4820–4900 Å) are analyzed to yield the radial velocity curves and the variations in the intensity and the width of Hβ emission lines during the quiescent phase at epoch 1978 January 4–8. The present study disagrees with the claim by Leung and Schneider (1978) that the orbital
Keiichi Kodaira, Kihachiro Ichimura
openaire   +1 more source

Observation of enhanced emission of the O VIII Hα line in a recombining laser-produced plasma

Applied Physics Letters, 1984
We have observed enhanced emission of the O VIII Hα line at 121 eV from a recombining plasma produced by laser heating of a thin Formvar foil with two opposed cylindrically focused (0.3×1.4 cm) 5-TW laser beams. The time-dependent intensity of the Hα line increases by nearly an order of magnitude as the plasma length is increased from 0.27 to 1.27 cm ...
D. L. Matthews, E. M. Campbell, K. Estabrook, W. Hatcher, R. L. Kauffman, R. W. Lee, C. L. Wang   +6 more
openaire   +1 more source

Variation of the Hβ Emission Lines of YY Geminorum. II. Change of Sectorial Structures of Active Regions

Publications of the Astronomical Society of Japan, 1982
Abstract Sixty-three image-tube spectrograms of YY Gem (4 Å mm−1, λλ4820–4900 Å) are analyzed to yield the radial-velocity curves and the variations in the intensities and the widths of Hβ emission lines during the quiescent phase at epochs 1980 February 11–16, 1981 January 14–15, and 1981 March 11.
Keiichi Kodaira, Kihachiro Ichimura
openaire   +1 more source

Spectral variability of the 3C 390.3 nucleus for more than 20 years – II.  Variability of the broad emission-line profiles and He ii λ4686 Å emission-line fluxes

Monthly Notices of the Royal Astronomical Society, 2020
S G Sergeev
exaly  

Emission-line properties of IllustrisTNG galaxies: from local diagnostic diagrams to high-redshift predictions for JWST

Monthly Notices of the Royal Astronomical Society, 2023
Anna Feltre, Dylan Nelson, Michaela Hirschmann   +2 more
exaly  

Computational study of nozzle spray-line distribution effects on stratified mixture formation, combustion and emissions of a high compression ratio DISI methanol engine under lean-burn condition

Energy, 2020
Yulin Chen, Jingzhen Sun, Changming Gong
exaly  

Phenomenology of Broad Emission Lines in Active Galactic Nuclei

Annual Review of Astronomy and Astrophysics, 2000
Paola Marziani, J W Sulentic, D Dultzin-Hacyan   +2 more
exaly  

Double-peaked emission lines as a probe of the broad-line regions of active galactic nuclei

New Astronomy Reviews, 2009
Michael Eracleous
exaly  

Interpreting broad emission-line variations – I. Factors influencing the emission-line response

Monthly Notices of the Royal Astronomical Society, 2014
Kirk Korista
exaly