The ORFEUS II Echelle Spectrometer: Instrument description, performance and data reduction
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چکیده
منابع مشابه
ORFEUS II echelle spectra: H2 measurements in the Magellanic Clouds
More than 20 years after the Copernicus satellite, ORFEUS allows the investigation of molecular hydrogen (H2) in the diffuse interstellar medium by way of FUV absorption spectroscopy once again. This time, targets in the Magellanic Clouds were also observed, allowing the first investigation of cold H2 in a metal-poor environment outside the Milky Way disk. This paper presents new H2 measurement...
متن کاملORFEUS II echelle spectra: Absorption by H2 in the LMC
We report the first detection of H2 absorption profiles of LMC gas on the line of sight to star 3120 in the association LH 10 near the emission nebula N 11B. Transitions found in the Lyman band are used to derive a total column density N(H2) = 6.6× 1018 cm−2. Excitation temperatures of ≤ 50K for levels J ≤ 1 and of ' 470K for levels 2 ≤ J ≤ 4 of H2 are derived. We conclude that moderate UV pump...
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متن کاملThe Oriented Scintillation Spectrometer Experiment Instrument Description
The Oriented Scintillation Spectrometer Experiment (OSSE) on the Arthur Holly ComptonGammaRay Observatory satellite uses four actively-shielded NaI(Tl)-CsI(Na) phoswich detectors to provide gamma-ray line and continuum detection capability in the 0:05 10 MeV energy range. The instrument includes secondary capabilities for gamma-ray and neutron detection between 10 and 250 MeV. The detectors hav...
متن کاملORFEUS II echelle spectra : deuterium and molecular hydrogen in the ISM towards BD + 39 3226 ⋆
In ORFEUS II spectra of the sdO star BD +39 3226 interstellar hydrogen and deuterium is detected. From Ly α profile fitting and a curve of growth analysis of the Lyman se
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics Supplement Series
سال: 1999
ISSN: 0365-0138,1286-4846
DOI: 10.1051/aas:1999156