Balmer Discontinuity Temperatures in the Orion Nebula

Details Balmer Discontinuity Temperatures in the Orion Nebula Balmer Discontinuity Temperatures in the Orion Nebula

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450l..59l&link_type=abstract

Astrophysical Journal Letters v.450, p.L59

Astronomy and Astrophysics

Astronomy

20

Ism: H Ii Regions, Ism: Abundances, Ism: Individual Name: Orion Nebula

Scientific paper

We have mapped the Balmer discontinuity temperature Te(BJ) along two long-slit positions in the Orion Nebula, using high-quality spectra obtained with the ESO 1.52 m telescope and with the 3.9 m AAT. One slit was oriented north-south and positioned 40" west of theta 1 C Ori. The second slit was oriented east-west, with its eastern end 10" west of theta 1 C Ori, identical to the slit position previously studied by Walter & Dufour (1994). For the NS slit, both the 1.52 m and the AAT data yield a constant temperature of about 9000 K, with variations of only a few hundred K over a total slit length of about 3.'5. For the EW-slit, our data reveal two distinct regions of nearly constant temperatures of 8900 and 7200 K, respectively, possibly resulting from two separate H II regions. No evidence is found for the anomalously low temperatures reported by Walter and Dufour for the same region.

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