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PROSPECTS FOR DETERMINING THE COSMOLOGICAL HELIUM-3 TO HELIUM-4 RATIO VIA ABSORPTION-LINE STUDIES OF THE LOCAL INTERSTELLAR MEDIUM
MARK HURWITZ and STUART BOWYER
Publications of the Astronomical Society of the Pacific
Vol. 97, No. 589 (March 1985), pp. 214-218
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40678475
Page Count: 5
You can always find the topics here!Topics: Velocity, Helium, Spectral resolution, White dwarfs, Astronomical cosmology, Flux density, Interstellar medium, Isotope ratios, Line spectra, Neutrinos
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We consider the prospects for determining the interstellar helium-3 to helium-4 ratio via absorption-line studies in the extreme ultraviolet. For the purpose of this study we have assumed a high-resolution extreme ultraviolet spectrometer fed by a 1-meter class telescope similar to that discussed in the Far Ultraviolet Spectroscopic Explorer (FUSE) Report. We find that detection of helium-3 may be possible with less than three days of observing time. To measure the helium-3 to helium-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.
Publications of the Astronomical Society of the Pacific © 1985 The University of Chicago Press