Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419..181s&link_type=abstract
Astrophysical Journal v.419, p.181
Astronomy and Astrophysics
Astronomy
65
Galaxies: Starburst, Ism: H Ii Regions, Infrared: Interstellar: Lines
Scientific paper
The strength of the He I 2.06 microns emission line relative to hydrogen recombination features has been previously proposed as a diagnostic of effective temperature Teff for stars powering H II regions. Such an indicator would be of particular interest for constraining the high-end initial mass function in starbursts I reexamine the sensitivity of the 2.06 microns feature to nebular conditions, and find that constraints on the ionizing continuum shape are difficult to determine in the absence of additional constraints on nebular properties. The He I 2.06 μm/Brγ ratio is sensitive to the relative volumes of He+ and H+, as well as to the relative ionization fractions of He and H within the He+ zone, both of which respond to variation in Teff Predicted values of this line ratio are also sensitive to nebular geometry, density, dust content, velocity structure, and helium abundance. Constraints on Teff based on other helium lines and on alternative diagnostics are likely to be more reliable.
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