Spectroscopy of H ii regions at 2 ${rm mu m}$: ultracompact sources

We have measured the line fluxes of He i $2.058 \ {\rm \mu m}$ and Br $\gamma \ 2.165 \ {\rm \mu m}$ from ultra-compact (UC) H ii regions excited by stars of spectral types O4 to B1. The ratio of these two lines is compared with theoretical predictions of the dependence of this ratio on the effectiv...

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Veröffentlicht in:	Monthly notices of the Royal Astronomical Society 1994-01, Vol.266 (2), p.497-510
Hauptverfasser:	Doherty, Ruth M., Puxley, Phil, Doyon, René, Brand, Peter W. J. L.
Format:	Artikel
Sprache:	eng
Schlagworte:	H ii regions infrared: stars
Online-Zugang:	Volltext
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