airtovac¶
-
pydl.goddard.astro.
airtovac
(air)[source]¶ Convert air wavelengths to wavelengths in vacuum.
Parameters: - air : array-like
Values of wavelength in air in Angstroms.
Quantity
objects with valid length dimensions will be internally converted to Angstrom.
Returns: - array-like
Values of wavelength in vacuum in Angstroms. If a
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.