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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Hundred observations of Delta Scorpii, from April to September 2011, made forAAVSO visually and digitally with a commercial CMOS camera have been plotted.The three most luminous pixels either of the target star and the two referencestars are used to evaluate the magnitude through differential photometry. Themain sources of errors are outlined. The system of Delta Scorpii, aspectroscopic double star, has experienced a close periastron in July 2011within the outer atmospheres of the two giant components. The whole luminosityof Delta Scorpii increased from about Mv=1.8 to 1.65 peaking around 5 to 15July 2011, but there are significant rapid fluctuations of 0.2-0.3 magnitudesoccuring in 20 days that seem to be real, rather than a consequence ofsystematic errors due to the changes of reference stars and observingconditions. This method is promising for being applied to other bright variablestars like Betelgeuse and Antares.

Delta Scorpii 2011 periastron: visual and digital photometric campaign