vactoair¶
- pydl.goddard.astro.vactoair(vacuum)[source]¶
Convert vacuum wavelengths to wavelengths in air.
- Parameters:
- vacuumarray-like
Values of wavelength in vacuum in Angstroms.
Quantity
objects with valid length dimensions will be internally converted to Angstrom.
- Returns:
- array-like
Values of wavelength in air in Angstroms.
Quantity
object was passed in, the output will be converted to the same units as the input.
Notes
Formula from P. E. Ciddor, Applied Optics, 35, 1566 (1996).
Values of wavelength below 2000 Å are not converted.