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

We report the discovery of a square axisymmetric circumstellar nebula aroundthe emission-line star HD 93795 in archival Spitzer Space Telescope 24 microndata. We classify HD 93795 as an B9 Ia star using optical spectra obtained withthe Southern African Large Telescope (SALT). A spectral analysis carried outwith the stellar atmosphere code FASTWIND indicates that HD 93795 only recentlyleft the main sequence and is evolving redward for the first time. We discusspossible scenarios for the origin of the nebula and suggest that HD 93795 wasoriginally a binary system and that the nebula was formed because of merger ofthe binary components. We also discuss a discrepancy between distance estimatesfor HD 93795 based on the Gaia data and the possible membership of this star ofthe Car OB1 association, and conclude that HD 93795 could be at the samedistance as Car OB1.

HD 93795: a late-B supergiant star with a square circumstellar nebula