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The interstellar extinction law is important for interpreting observations and inferring the properties of interstellar dust grains. Based on the 993 prism/CLEAR spectra from the James Webb Space Telescope (JWST), we investigate 0. 6-5. 3\, m interstellar dust extinction law. We propose a pair method to obtain the reddening curves based only on JWST observed spectra. Most of the high extinction sources are toward the young star cluster Westerlund 2. The infrared (IR) 1. 0-5. 3\, m reddening curves agree with the power-law A_ ^- well. We determine an average value of =1. 980. 15, which is consistent with the average value of the Galaxy. We find that may be variable and independent of R ₕ. With the derived, we convert the reddening curves into the extinction curves and establish the non-parameterized -dependent extinction curves in the wavelength range of 0. 6-5. 3\, m. At <1\, m, the derived extinction law is not well described by the parameterized power-law type curve. Our non-parameterized -dependent extinction curves are suitable for the extinction correction of JWST-based photometry and spectra measurements at 0. 6-5. 3\, m. We also provide the extinction coefficients for the JWST NIRCam bandpasses with different.
Wang et al. (Tue,) studied this question.