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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
Stable URL: http://www.jstor.org/stable/40678475
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
PROSPECTS FOR DETERMINING THE COSMOLOGICAL HELIUM-3 TO HELIUM-4 RATIO VIA ABSORPTION-LINE STUDIES OF THE LOCAL INTERSTELLAR MEDIUM
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Abstract

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.

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