178-185]: 1) doppler broadening of emission lines
, 2) density gradients in the corona, 3) radio brightness, and 4) ionization equilibrium.
The panoramic Echelle spectra in the spectral range 200-700 nm show the UV emission lines
of aluminum as a major element and the emission lines
of Si, Cu, Be, Fe, Mn and Mg in the aluminum alloy sample.
The weaker, low-contrast features immediately identifiable as emission lines
in the CCD spectrum can hardly be seen in the photographic version; even the high-contrast lines appear spread out.
On the other hand, the electron number density can be obtained from the Stark-broadening of the emission lines
The model suggested by Draine and Woods predicts that other, not-yet-observed emission lines
should also be weaker than expected.
VV Cep is a prototype of variable binaries consisting of an aging supergiant and a hot dwarf star, whose spectra exhibit strong hydrogen and iron emission lines
The temperatures were determined form the emission line
intensities of Mn, V, Co, and Pb observed in the laser-induced plasma of soil sediments.
The bright emission lines
are due to ionized gases that have been excited to shine by radiation from the nebula's central star.
By the 1960s, spectral measurements made with the instrument were already showing emission lines
of the element mercury due to street lights.
A workshop discussed equipment and techniques for small-telescope spectroscopy, such as monitoring Be stars that show changing emission lines
ROSAT-2/SPECTROSAT (launch 1992 or 1993) will carry a spectrograph to study the X-ray emission lines
(cyclotron-resonance lines) found in the spectra of magnetic neutron stars.
Humason its optical spectrum is continuous, without absorption or emission lines