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Gamma-Ray Emission from the Orion Cloud Complex and the Ratio CO/H2

Catala, C.; Masnou, J. L.; Strong, A.

A new value for the density ratio of H2/(C-13)O is derived by making a comparison between the COS-B gamma-ray survey above 100 MeV and the CO survey of the Orion cloud complex. Results rely on the assumption that the gamma-ray emissivity above 100 MeV is uniform over the whole cloud complex and its surroundings, and has the local value derived by …

Two years of observation with the international ultraviolet explorer

Lamers, H. J. G. L. M.; de Jager, C.

The launching of I.U.E., in January 1978, has provided the astronomical community with a powerful observatory-type spacecraft enabling one a practically continuous observation of ultra-violet spectra of celestial bodies. Two years of operation have led to many new developments, in which a large number of astronomers participated. This review summa…

Ultraviolet emissions from the upper atmospheres of the planets

Moos, H. W.

A large number of atoms and molecules have strong emission lines in the vacuum ultraviolet. As a result, this spectral region is particularly suited to studying the upper atmospheres of the planets. The observed emissions not only identify the constituents, but also provide information on the solar and magnetospheric excitation processes. Long ter…

The object glass of the Airy transit circle at Greenwich

Lowne, C. M.

Allocation of telescope time: in praise of parsimony

Penston, M. V.; Darius, J.

Ultraviolet Observations of Mv-Lyrae

Maraschi, L.; Tanzi, E. G.; Chiappetti, L. +1 more

IUE Observatory / European Space Agency / Villafranca Satellite Tracking Station

Penston, M. V.