First optical spectra of the near side of the Cygnus Loop - A preliminary report

Details First optical spectra of the near side of the Cygnus Loop - A preliminary report First optical spectra of the near side of the Cygnus Loop - A preliminary report

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..811s&link_type=abstract

(Rice University and University of Texas, Texas-Mexico Conference on Astrophysics: Plasmas in Astrophysics, 3rd, Rice University

Astronomy and Astrophysics

Astrophysics

2

Shock Waves, Stellar Spectra, Supernova Remnants, Visible Spectrum, Emission Spectra, H Alpha Line, Line Spectra

Scientific paper

A preliminary analysis of the first optical spectra of nebulosity in the central and north-central portions of the Cygnus Loop supernova remnant are presented. Eighteen of the 19 observed locations have the spectra of classical, radiative shock waves; they feature the usual prominent emission lines of H-alpha, (N II), and (S II). However, the spectra of the nineteenth location are dominated by the H-alpha line and thus suggest the presence of nonradiative shocks. All of the spectra display blueshifts and intensities whose ranges are in general agreement with previous interferometric H-alpha observations.

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