  A study on the photosphere and disc of the Be star $\beta$ Psc is presented.
We recover almost 40 years of high-resolution spectroscopic observations and
additional data gathered from the BeSS database. We evaluate the photospheric
parameters from the SED and fittings of state-of-the-art non-LTE model
atmospheres to observed helium, carbon, silicon and magnesium line profiles.
Our models include the stellar geometric deformation as well as the co-latitude
dependence of temperature and gravity, aiming to derive the effects of rotation
on the stellar parameters. We estimate the circumstellar disc parameters from
the fitting of models assuming different disc properties, namely its radius and
gas density profile. The disc inclination angle $i$ is constrained from the
fittings of He I 4471 \r{A}, Mg II 4481 \r{A}, C II 4267 \r{A}, and Si II 4128,
4132 \r{A} lines with gravity darkened models. Our findings, based on model
fittings, suggest that during the last 40 years the disc radius changed within
the interval $5.5 \le R_d \le 7.8$ $R_*$, the disc base gas density within $5
\times 10^{-13} \le \rho \le 1 \times 10^{-12} g cm^{-3}$, while the radial
power-law density index $m$ assumed values between 2.0 and 2.3. These results
are in agreement with recent works dealing with spectroscopic and
interferometric measurements of this object.
