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Ultraviolet spectra of the Cygnus loop-depletion of the heavy elements

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Abstract

A comparison between the observed UV spectra and detailed consistent calculations of the Cygnus Loop is presented. The results demonstrate that the spectra can be explained by supposing that the Cygnus Loop (C.L.) moves into a fully ionized gas. The [O III]/Hβ ratio is shown to be an indicator to the fraction of He++ in the gas entering the shock.

Further results are:

(a) Observed shocks of higher velocity propagation move into regions of lower density; (b) the optical and UV spectra are emitted by very close and almost overlapping shocks (c) fast shocks (v≳240 km s−1) propagation in the intercloud medium produce the X-ray emission, however, they can also produce faint Hα on impinging interstellar clouds.

We find that carbon (CI, CII, CIII, and CIV) depletion relative to other heavy elements is not more than a factor ∼3; whereas, we confirm that all heavy elements, relative to their solar abundance, are depleted by a factor ∼10. Heavy elemental depletion is likely to result formation of grains, sputtering and molecules in ISM.

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Author notes

  1. M. Contini

    Present address: Instituto Astronômico e Geofisico, U.S.P., São Paulo, SP, Brazil

Authors and Affiliations

  1. Dept. of Physics and Astronomy, Tel-Aviv University, Ramat Aviv, Tel-Aviv, Israel

    M. Contini & G. Shaviv

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  1. M. Contini
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  2. G. Shaviv
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Contini, M., Shaviv, G. Ultraviolet spectra of the Cygnus loop-depletion of the heavy elements. Astrophys Space Sci 85, 203–219 (1982). https://doi.org/10.1007/BF00653443

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  • DOI: https://doi.org/10.1007/BF00653443

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