Anomalous Balmer continuum temperatures in the Orion Nebula

Details Anomalous Balmer continuum temperatures in the Orion Nebula Anomalous Balmer continuum temperatures in the Orion Nebula

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434l..29w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 434, no. 1, p. L29-L32

Physics

4

Abundance, Balmer Series, Continuums, Discontinuity, H Ii Regions, Orion Nebula, Temperature Profiles, Light Scattering, Near Ultraviolet Radiation, Recombination Reactions, Spatial Resolution

Scientific paper

New long-slit spectra of the Orion Nebula in the near-ultraviolet were used to calculate the Balmer recombination temperature, T(Bac), from the Balmer discontinuity at 3646 A. The spatially resolved data show a decrease in temperature moving to the west of Theta1 Ori C, from 8400 K at a distance of 40 sec to a low of 2800 K at a distance of 220 sec. Such values are much lower than previously reported. The effect of scattered starlight on these results is calculated and shown to be less than 10%. Previous studies which found scattered light to be important at the discontinuity are in error. Such low temperatures and their impact on nebular physics and abundances are disconcerting and require further study.

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