7. Example 4 - Beyond 2.3 microns K-band Longslit Point Source (111 l/mm grating)

In this example, we will reduce a GNIRS K-band longslit observation with a central wavelength beyond 2.3 m with the 111 l/mm grating. The target is HD 179821, likely a yellow hypergiant star.

The particularity of this sequence is that the arc lamp has only five lines and the OH and O₂ lines are absent beyond 2.3 m. To get an accurate wavelength calibration, we have to use The emission features in the sky spectrum of the science observations.

• 7.1. Example 4 - Datasets description
• 7.2. Example 4 - K-band 2.33 micron Longslit Point Source (111 l/mm grating) - Using the “reduce” command line
• 7.3. Example 4 -K-band 2.33 micron Longslit Point Source (111 l/mm grating) - Using the “Reduce” class API