A spectroscopic determination of the IR extinction curve in the direction of G333.6 - 0.2

Astronomy and Astrophysics – Astrophysics

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H Lines, Hydrogen Recombinations, Infrared Spectroscopy, Interstellar Extinction, Black Body Radiation, Dwarf Stars, Electron Density (Concentration), H Ii Regions, Stellar Spectrophotometry

Scientific paper

Several hydrogen recombination lines have been measured in the range 1.6-4.6 microns in the direction the southern H II region G333.6 - 0.2, and the results are used to determine the extinction curve. The overall behavior of the curve as a function of wavelength is well described by a power-law function proportional to the -1.85 + or -0.05 power of the wavelength.This curve is not significantly affected by extinction variations in the beam and is the most precise measurement to date of the extinction curve in the near infrared. This result confirms that, for many practical purposes, the van de Hulst curve No. 15 can provide an adequate description of the IR extinction curve.

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