English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

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 andadditional data gathered from the BeSS database. We evaluate the photosphericparameters from the SED and fittings of state-of-the-art non-LTE modelatmospheres to observed helium, carbon, silicon and magnesium line profiles.Our models include the stellar geometric deformation as well as the co-latitudedependence of temperature and gravity, aiming to derive the effects of rotationon the stellar parameters. We estimate the circumstellar disc parameters fromthe fitting of models assuming different disc properties, namely its radius andgas density profile. The disc inclination angle $i$ is constrained from thefittings 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 modelfittings, suggest that during the last 40 years the disc radius changed withinthe 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 radialpower-law density index $m$ assumed values between 2.0 and 2.3. These resultsare in agreement with recent works dealing with spectroscopic andinterferometric measurements of this object.

The H$\alpha$ line emission of the Be star $\beta$ Psc: the last 40 years