Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..214h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, March 1985, p. 214-218.
Astronomy and Astrophysics
Astronomy
3
Absorption Spectroscopy, Abundance, Extreme Ultraviolet Radiation, Helium Isotopes, Interstellar Matter, Ultraviolet Spectroscopy, Astronomical Spectroscopy, Cosmology, Deuterium, Neutrinos, Nuclear Fusion, White Dwarf Stars
Scientific paper
The prospects for determining the interstellar (He-3)/(He-4) ratio via absorption-line studies in the extreme ultraviolet are considered. A high-resolution extreme-ultraviolet spectrometer fed by a 1-meter-class telescope similar to that discussed in the Far Ultraviolet Spectroscopic Explorer Report (1983) is assumed, and it is found that detection of He-3 may be possible with less than three days of observing time. To measure the (He-3)/(He-4) ratio with sufficient precision to determine the number of light neutrino species will require over 50 days of integration time for each object studied.
Bowyer Stuart
Hurwitz Margaret M.
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