We present an analysis of high-resolution spectroscopic observations of Polaris B , the optical companion of the Polaris Ab system .
The star has a radial velocity V _ { r } of -16.6 km s ^ { -1 } to -18.9 km s ^ { -1 } , and a projected rotational velocity v \sin i = 110 km s ^ { -1 } .
The derived atmosphere parameters are : T _ { \mathrm { eff } } =6900 K ; \log g = 4.3 ; V _ { \mathrm { t } } =2.5 km s ^ { -1 } .
Polaris B has elemental abundances generally similar to those of the Cepheid Polaris A ( Usenko et al .
2005a ) , although carbon , sodium and magnesium are close to the solar values .
At a spectral type of F 3 { \sc v } Polaris B has a luminosity of 3.868 L _ { \sun } , an absolute magnitude of +3.30 ^ { m } , and a distance of 109.5 pc .
The mass of the star is estimated to be 1.39 { \mathcal { M } } _ { \sun } , close to a mass of 1.38 \pm 0.61 { \mathcal { M } } _ { \sun } for the recently-resolved orbital periods companion Polaris Ab observed by Evans et al .
( 2007 ) .