The spatial intensity distribution of selected emission lines for Herbig-Haro 1 - Comparison between theory and observations

Details The spatial intensity distribution of selected emission lines for Herbig-Haro 1 - Comparison between theory and observations The spatial intensity distribution of selected emission lines for Herbig-Haro 1 - Comparison between theory and observations

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1388n&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Oct. 1989, p. 1388-1393. Research supported by the University of Toronto and NSE

Astronomy and Astrophysics

Astronomy

31

Astronomical Spectroscopy, Emission Spectra, Herbig-Haro Objects, Luminous Intensity, Bow Waves, Forbidden Bands, H Alpha Line, Oxygen Spectra, Shock Waves

Scientific paper

In this paper, it is shown that most of the spatial intensity distribution of 11 selected emission lines for Herbig-Haro 1 (including the forbidden S II emission lines at 6731 A and 4069 A, the forbidden O III line at 5007 A, and the forbidden O II line at 3727 A) can be explained by a bow shock with a shock velocity of about 150-200 km/sec at the stagnation point, and under the assumption that the gas entering the shock is fully preionized. The results are based on three spectrograms (with a total exposure time of 180 min) obtained consecutively. Specifically, the ratios of each of the forbidden lines to H-alpha were studied, which permitted a critical test of the model. The agreement between the theoretical predictions and the observations was found to be remarkable, considering the complex geometry that a bow shock could have.

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