Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..977j&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Sept. 15, 1981, p. 977-983.
Astronomy and Astrophysics
Astronomy
16
Interstellar Matter, Molecular Clouds, Shock Wave Propagation, Supernova Remnants, Ultraviolet Astronomy, Absorption Spectra, Carbon, Gas Density, Iue
Scientific paper
Strong interstellar absorption lines of C I, arising from the two excited fine-structure levels, are found in IUE observations of HD 72350 (type B4 III). An analysis of the excited-level populations of C I gives local temperature and pressure limits, and auxiliary data on the limit of column density for excited O I and the carbon ionization help to establish that (1) the local temperature is within the limits of 25-100 K, and (2) the pressure/Boltzmann's constant ratio is at least 10 to the 4.3/cu cm K, despite its small size. This high-pressure cloud is discussed in terms of shock compression by the Vela supernova blast wave, along with the relationship of this kind of cloud compression to star formation and to the origin of the characteristic filamentary emission arcs seen in Vela and other supernova remnants
Jenkins Edward B.
Leep Myckky E.
Silk Joseph
Wallerstein George
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