Detalles de publicación
PP 06003
Faint emission lines in the Galactic H II regions M16, M20 and NGC~3603
(1) IAC, (2) IA-UNAM, Mexico, (3) Departamento de Astrofísica, ULL, (4) INAOE, Mexico (5) Universidad de Chile
We present deep echelle spectrophotometry of the Galactic {\hii} regions M16, M20 and NGC~3603. The data have been taken
with the Very Large Telescope Ultraviolet-Visual Echelle Spectrograph in the 3100 to 10400 \AA\ range.
We have detected more than 200 emission lines in each region.
Physical conditions have been derived using different continuum and line intensity ratios.
We have derived He$^{+}$, C$^{++}$ and O$^{++}$ abundances from pure
recombination lines as well as abundances from collisionally excited lines for
a large number of ions of different elements. We have obtained consistent
estimations of the temperature fluctuation parameter, {\ts}, using different methods. We also report the detection of deuterium Balmer lines up to D$\delta$ (M16)
and to D$\gamma$ (M20) in the blue wings of the hydrogen lines, which excitation mechanism seems to be continuum fluorescence.
The temperature fluctuations paradigm agree with the results obtained from optical CELs and the more uncertain ones from far
IR fine structure CELs in NGC~3603, although, more observations covering the same volume of the nebula are
necessary to obtain solid conclusions.
with the Very Large Telescope Ultraviolet-Visual Echelle Spectrograph in the 3100 to 10400 \AA\ range.
We have detected more than 200 emission lines in each region.
Physical conditions have been derived using different continuum and line intensity ratios.
We have derived He$^{+}$, C$^{++}$ and O$^{++}$ abundances from pure
recombination lines as well as abundances from collisionally excited lines for
a large number of ions of different elements. We have obtained consistent
estimations of the temperature fluctuation parameter, {\ts}, using different methods. We also report the detection of deuterium Balmer lines up to D$\delta$ (M16)
and to D$\gamma$ (M20) in the blue wings of the hydrogen lines, which excitation mechanism seems to be continuum fluorescence.
The temperature fluctuations paradigm agree with the results obtained from optical CELs and the more uncertain ones from far
IR fine structure CELs in NGC~3603, although, more observations covering the same volume of the nebula are
necessary to obtain solid conclusions.