We studied both components of a slightly overlooked visual binary HR 1847 spectroscopically to determine its basic physical and orbital parameters .
Basic stellar parameters were determined by comparing synthetic spectra to the observed echelle spectra , which cover both the optical and near-IR regions .
New observations of this system used the Ondřejov and Rozhen 2-m telescopes and their coudé spectrographs .
Radial velocities from individual spectra were measured and then analysed with the code FOTEL to determine orbital parameters .
The spectroscopic orbit of HR 1847A is presented for the first time .
It is a single-lined spectroscopic binary with a B-type primary , a period of 719.79 days , and a highly eccentric orbit with e = 0.7 .
We confirmed that HR 1847B is a Be star .
Its { \mathrm { H } } \alpha emission significantly decreased from 2003 to 2008 .
Both components have a spectral type B7–8 and luminosity class IV–V .