CHIEFS: Cosmological Helium Isotope EUV Feature Spectrometer

Details CHIEFS: Cosmological Helium Isotope EUV Feature Spectrometer CHIEFS: Cosmological Helium Isotope EUV Feature Spectrometer

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.7114h&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #71.14; Bulletin of the American Astronomical Society, Vol. 27, p.1386

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We discuss the mission concept ``CHIEFS,'' a two-channel, high resolution, extreme-ultraviolet spectrometer designed to measure the cosmologically important (3) He/(4) He ratio in the local interstellar medium. An overall instrument layout is presented, with raytraces of the twin Wadsworth optical system. We evaluate the integration times required for potential CHIEFS targets, and show sample absorption line profiles calculated from recent HST observations. Secondary science goals, including high resolution observations of stellar coronae/chromospheres, are discussed, and outstanding technical considerations are presented. This work is supported by NASA grant NAGW-4773.

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