Interstellar absorption of the extreme ultraviolet flux from two hot white dwarfs

Astronomy and Astrophysics – Astronomy

Scientific paper

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Far Ultraviolet Radiation, Hot Stars, Interstellar Extinction, Interstellar Matter, Stellar Radiation, Ultraviolet Absorption, White Dwarf Stars, Hydrogen Atoms, Lyman Alpha Radiation, Nitrogen Atoms, Ultraviolet Astronomy

Scientific paper

Photometric upper limits on the 300 A flux from the hot white dwarfs Feige 24 and G191-B2B are presented. The limits, which were obtained with a rocket-borne extreme ultraviolet imaging telescope, are interpreted as lower limits on the density of the intervening interstellar matter. The limits are used to investigate the state of interstellar gas within 100 pc. A local clumpiness factor, which is of value in planning future extreme ultraviolet observations, is derived.

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