The generally reported radii of large cool stars are Rosseland radii, defined as the radius of the photosphere at a specific optical depth of two thirds.
42.
What this means is that before performing the inversion, the continuum components from both the optical depth and from the species cross sections must be removed.
43.
The belts of the parent moonlets and particles are themselves invisible due to their low optical depth, while the dust reveals itself in forward-scattered light.
44.
Its normal optical depth is 0.0062 ?0.0015, which corresponds to an equivalent depth of 0.7 ?0.2 km.
45.
In other words, the solar radius at which we see the optical depth as being unity increases as we move our line of sight towards the limb.
46.
Ethane, acetylene and diacetylene condense in the colder lower part of stratosphere forming haze layers with an optical depth of about 0.01 in visible light.
47.
This set of assumptions leads directly to the mean intensity and source function being directly equivalent to a blackbody Planck function of the temperature at that optical depth.
48.
For instance, the optical depth for seawater at the 1.413 GHz microwave frequency, used for the Aquarius mission, is about 1 2 cm.
49.
An optical depth of 1 corresponds to a mean free path, which is the distance, on average that a photon travels before scattering from a dust grain.
50.
The Rosseland optical depth of 2 / 3 corresponds approximately to a visible surface while a Rosseland depth of 20 or 100 corresponds more closely to a physical photosphere.
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