A preliminary measurement of the doppler and compton effect in the blue spectrum of 13 monocerontis

A preliminary radial velocity of 13 Mon and the redshift caused by the scattering of photons in its chromosphere are given. They have been obtained from the wavelengths of 39 spectral lines, measured in 2 spectra and the corresponding halfwidth measured in 4 spectra, taken in 1980 with a dispersion of about 9 Å/mm. (1 Å = 0.1 nm), in the range 3700 Å-5000 Å.