Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255..323l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. 323-349.
Astronomy and Astrophysics
Astrophysics
16
Absorption Spectra, Emission Spectra, Galactic Structure, Interstellar Matter, Neutral Gases, Spectral Bands, Astronomical Models, Astronomical Spectroscopy, Galactic Evolution, Molecular Clouds, Space Observations (From Earth)
Scientific paper
The structure and distances of high-latitude (l between 35 and 75 deg) neutral gas clouds constituting the galactic H I shell GS 57 + 41 (which, due to its location in the constellation of Hercules was named 'Hercules shell') are investigated, using the results of an extensive survey of interstellar Na I D absorption lines to determine distances to the various neutral clouds and filaments in this field of the sky. Based on the distances, conclusions are drawn with regard to the morphological structure and the physical parameters of the GS 57 + 41. The results of optical high-resolution absorption and 21 cm emission line measurements of the various H I clouds were compared with the cirrus of IRAS 100 micron dust emission, as well as with the diffuse X-ray background emission in this area.
de Boer Klaas. S.
Hirth W.
Lilienthal Dietmar
Mebold Ulrich
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