Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..883d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 883-890. NSERC-supported research.
Astronomy and Astrophysics
Astrophysics
17
Fabry-Perot Spectrometers, Hydrogen Clouds, Molecular Clouds, Reflection Nebulae, Star Formation, Cepheus Constellation, Emission Spectra, Herbig-Haro Objects, Line Spectra
Scientific paper
Fabry-Pérot spectrometry of H2 emission lines in the Cepheus A star-formation region is presented. A map of the υ = 1-0 S(1) line intensity shows two main lobes of emission (Cep A(E) and Cep A(W)) separated by approximately 2arcmin along an east-west axis. The H2 emission in Cep A(E) is associated with dense condensations of NH3 and CS, while the emission in Cep A(W) is associated with Herbig-Haro objects and reflection nebulae. The H2 line intensity ratios and the line profiles show that the observed H2 gas is excited by shocks. These data support the hypothesis that the two lobes of emission are produced by a single outflow originating from the region of masers and compact H II regions at the western edge of Cep A(E).
Doyon Rene
Nadeau Daniel
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