Solar abundance determination from ultraviolet emission lines

Solar Physics ◽  
1967 ◽  
Vol 1 (2) ◽  
pp. 229-241 ◽  
Author(s):  
Andrea K. Dupree ◽  
Leo Goldberg
Keyword(s):  
Emission Lines ◽  
Solar Abundance ◽  
Ultraviolet Emission ◽  
Abundance Determination

scholarly journals Interpretation of the Ultraviolet Spectrum of NGC 7662

1978 ◽  
Vol 76 ◽  
pp. 121-122
Author(s):  
R.C. Bohlin ◽  
J.P. Harrington ◽  
T.P. Stecher
Keyword(s):  
Neutral Hydrogen ◽  
Central Star ◽  
Dielectronic Recombination ◽  
Emission Lines ◽  
Ultraviolet Emission ◽  
Two Photon ◽  
Carbon Abundance ◽  
Photon Process ◽  
Ngc 7662

The ultraviolet emission lines that were me asured in the spectrum obtained from our rocket observation of NGC 7662 have been compared with those predicted by a set of models. The models allow a determination of the carbon abundance which is found to be solar and the C/0 ratio which is equal to unity. In order to obtain a good fit, dielectronic recombination and charge exchange between neutral hydrogen and C IV were included, both of which increase the concentration of C III. The observed continuum consists of light from the central star and from the nebula, which contributed primarily via the two photon process in the H° and the Balmer continuum.

scholarly journals Ultraviolet emission line imaging of planetary nebulae with GALEX

2011 ◽  
Vol 7 (S283) ◽  
pp. 308-309 ◽  
Author(s):  
Luciana Bianchi ◽  
Arturo Manchado ◽  
Karl Forster
Keyword(s):  
Galaxy Evolution ◽  
Broad Band ◽  
Planetary Nebulae ◽  
Emission Lines ◽  
Continuum Emission ◽  
Ultraviolet Emission ◽  
The Galaxy ◽  
Optical Domain ◽  
Line Imaging ◽  
Shock Fronts

AbstractGALEX (the Galaxy Evolution Explorer) has provided far-UV(1344-1786Å) and near-UV(1771-2831Å) imaging of several Planetary Nebulae (e.g., Bianchi et al. 2008, Bianchi 2012), with flux limits ~27.5 mag/sq.arcsec for objects in the Medium-deph Imaging Survey (MIS). PNe images in the GALEX broad-band UV filters include flux from both nebular line and continuum emission. We use the GALEX grism observing mode to obtain slitless spectral imaging of a sample of PNe with diameters >1′, in the near-UV. We show the first data from this program. The grism produces 2D images of the prominent UV nebular emission lines, when such lines dominate the flux. Combined with monochromatic images of diagnostic lines in the optical domain, such data help detect and interpret ionization and shock fronts, especially in faint nebular regions.

The narrow ultraviolet emission lines of the red dwarf AU Microscopii (dM1.6e)

1983 ◽  
Vol 270 ◽  
pp. L17 ◽  
Author(s):  
T. R. Ayres ◽  
K. Eriksson ◽  
J. L. Linsky ◽  
R. E. Stencel
Keyword(s):  
Emission Lines ◽  
Ultraviolet Emission

scholarly journals Experiment to Determine the Temperature Structure in the Solar Chromosphere and Corona

1972 ◽  
Vol 14 ◽  
pp. 668-669
Author(s):  
C. R. Negus
Keyword(s):  
Transition Region ◽  
Extreme Ultraviolet ◽  
Normal Incidence ◽  
Research Unit ◽  
Emission Lines ◽  
Solar Chromosphere ◽  
Temperature Structure ◽  
Ultraviolet Emission ◽  
Ionization Temperature ◽  
Intensity Ratios

An experiment is in course of preparation at the Astrophysics Research Unit at Culham for flight on a Sun-pointing rocket. It is designed to determine the ionization temperature and electron density as a function of height in the temperature range of about 8 × 104 K to 3 × 106 K by measuring limb to disk intensity ratios of extreme ultraviolet emission lines in the 170 to 850 Å region. The work is an extension of current experiments in which normal-incidence spectrographs are used to determine the structure lower in the chromosphere-corona transition region.

Extreme‐Ultraviolet Emission Lines of Sxin Solar Flare and Active Region Spectra

2004 ◽  
Vol 601 (1) ◽  
pp. 565-569 ◽  
Author(s):  
F. P. Keenan ◽  
A. C. Katsiyannis ◽  
K. G. Widing
Keyword(s):  
Active Region ◽  
Solar Flare ◽  
Extreme Ultraviolet ◽  
Emission Lines ◽  
Ultraviolet Emission

A Search for Far-Ultraviolet Emission Lines from Diffuse Hot Gas in the Halo of NGC 4631

1995 ◽  
Vol 454 (1) ◽  
Author(s):  
Henry C. Ferguson ◽  
W. Van Dyke Dixon ◽  
Arthur F. Davidsen ◽  
Ralf-Juergen Dettmar
Keyword(s):  
Emission Lines ◽  
Ultraviolet Emission ◽  
Hot Gas ◽  
Far Ultraviolet
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