XUV observations of Capella and the local interstellar medium

Details XUV observations of Capella and the local interstellar medium XUV observations of Capella and the local interstellar medium

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..678b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 678-681.

Astronomy and Astrophysics

Astronomy

7

Extreme Ultraviolet Radiation, Interstellar Matter, Stellar Spectra, Ultraviolet Astronomy, X Ray Astronomy, X Ray Stars, Emission Spectra, Gas Density, Helium, Rocket-Borne Instruments, Spectrometers

Scientific paper

Capella was observed in the 170 Å to 450 Å band by a rocket-borne spectrometer with a spectral resolution of 35 Å. Minimum flux sensitivity varied with wavelengths from 0.2 to 0.6 photons cm-2 s-1 at 180 Å and 304 Å, respectively. The anticipated prominent stellar emission line in this bandpass is He II 304 Å, and the Capella flux at Earth in this line is expected to be in the range 1.4 - 2.8 photons cm-2 s-1. No significant flux was observed in the bandpass. The failure can be explained by absorption in the local interstellar medium. Together with earlier Copernicus data the upper limit to the line is used to discuss the ionization state of the local interstellar medium.

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