Balmer decrement and interstellar redenning

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Robin Leadbeater

Also the ratio of H alpha/H beta emission in nebulae for example is useful for measuring the amount of interstellar extinction eg as described here

In fact there are a number of interesting measurements you can make based on measuring the relative intensity of various lines in planetary nebulae using just a low resolution spectrograph, as described in Francois Teyssier’s low resolution spectroscopy observers guide

and detailed on his website here