Optical kinematics in the Cygnus Loop. II - Interpretation

Details Optical kinematics in the Cygnus Loop. II - Interpretation Optical kinematics in the Cygnus Loop. II - Interpretation

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..265g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 265-277.

Astronomy and Astrophysics

Astrophysics

7

Image Analysis, Kinematics, Supernova Remnants, Adiabatic Conditions, Emission Spectra, H Alpha Line, Radiative Heat Transfer, Shock Fronts

Scientific paper

Imaging Fabry-Perot observations in the lines of H alpha and O III were made of selected regions in the Cygnus Loop supernova remnant and a summary of the observations is given. Observations of the small-scale radial velocity structure of optical filaments are discussed and consideration is given to interpretation of the gas kinematics. The cloud model and radiative-sheet model are reviewed and it is concluded that the optical kinematics of the Cygnus Loop bear a greater resemblance to the radiative-sheet model. It is suggested that a narrow O III component is associated with the remnant and may be due to photoionized gas in the precursor region. This component allows the estimation of the systemic velocity of the Cygnus Loop and the derivation of a kinematic distance.

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