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

B[e] supergiants are luminous, massive post-main sequence stars exhibitingnon-spherical winds, forbidden lines, and hot dust in a disc-like structure.The physical properties of their rich and complex circumstellar environment(CSE) are not well understood, partly because these CSE cannot be easilyresolved at the large distances found for B[e] supergiants (typically $\ga1$~kpc). From mid-IR spectro-interferometric observations obtained withVLTI/MIDI we seek to resolve and study the CSE of the Galactic B[e] supergiantCPD-57\degr\,2874. For a physical interpretation of the observables(visibilities and spectrum) we use our ray-tracing radiative transfer code(FRACS), which is optimised for thermal spectro-interferometric observations.Thanks to the short computing time required by FRACS ($<10$~s per monochromaticmodel), best-fit parameters and uncertainties for several physical quantitiesof CPD-57\degr\,2874 were obtained, such as inner dust radius, relative fluxcontribution of the central source and of the dusty CSE, dust temperatureprofile, and disc inclination. The analysis of VLTI/MIDI data with FRACSallowed one of the first direct determinations of physical parameters of thedusty CSE of a B[e] supergiant based on interferometric data and using a fullmodel-fitting approach. In a larger context, the study of B[e] supergiants isimportant for a deeper understanding of the complex structure and evolution ofhot, massive stars.

Fast ray-tracing algorithm for circumstellar structures (FRACS). II. Disc parameters of the B[e] supergiant CPD-57° 2874 from VLTI/MIDI data