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 present the analysis of photometric and spectroscopic data of twoclassical Cepheids, FN Aquilae and V1344 Aquilae. Based on the joint treatmentof the new and earlier radial velocity data, both Galactic Cepheids have beenfound to be a member in a spectroscopic binary system.  To match the phases of the earlier radial velocity data correctly with thenew ones, we also determined the temporal behaviour of the pulsation period ofthese Cepheids based on all available photometric data. The O-C graph coveringabout half century shows slight changes in the pulsation period due to stellarevolution for both Cepheids.

Discovery of the spectroscopic binary nature of the classical Cepheids FN Aql and V1344 Aql