Conversion from vacuum to standard air wavelengths
نویسنده
چکیده
We explore possible expressions for the conversion between vacuumwavelengths and wavelengths in standard air. We find that the equation proposed in the SDSS website is not appropriate for APOGEE. The differences between the available approximations in the H band are at the level of a fraction of a milliAngstroms, or several meters per second, and a significant contribution is related to the change in the definition of standard air. The most recent revision seems a sensible choice, and a second-order polynomial can be used in the H-band without any loss of accuracy. It is recommended that vacuum wavelengths be used for APOGEE.
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تاریخ انتشار 2011