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Since the total energy radiated by a star cannot be directly observed (except in the case of the Sun), the effective temperature is a derived quantity rather than an observed one.
We will therefore find a derived quantity that we can monitor based on the other available quantities.
The standard deviation of this derived quantity was calculated according to formula 5.
The uncertainty of a derived quantity is also calculated according to Equation 3.
A derived quantity is a term that is not measured explicitly; it is calculated from other primary measurements.
In both methods (1) and (2) the PS is therefore a derived quantity that requires first measuring other primary parameters.
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A large number of derived quantities can be selected and calculated online.
Measuring temperatures, mechanical loads and derived quantities precisely and reliably play an important role in spaceflight.
Limitations of the model reduction method in predicting secondary (derived) quantities are discussed.
For our purposes however, it will be sufficient to focus on two simple derived quantities, (r_{0}) and (r_{1}).
The crucial question is how to distinguish the derived quantities that are the most fundamental, or at least more fundamental than the others.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com