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

We introduce the first g-mode pulsator found to reside on the classical bluehorizontal branch. We extend the original discovery dataset to include morethan 3 years of continuous photometry of KIC 1718290, which reveals a richspectrum of low-amplitude modes with periods between one and twelve hours, mostof which follow a regular spacing of 276.3 s. This mode structure stronglyresembles that of the V1093 Her pulsators, with only a slight shift towardslonger periods. Our spectroscopy, however, reveals KIC 1718290 to be quitedistinct from the sdB stars that show V1093Her pulsations, which all havesurface gravities higher than log g = 5.1 and helium abundances depleted by atleast an order of magnitude relative to the solar composition. We find that KIC1718290 has T_eff = 22 100 K, log g = 4.72, and a supersolar helium abundance(log He/H = -0.45). This places it well above the extreme horizontal branch,and rather on the very blue end of the classical horizontal branch. We concludethat KIC 1718290 must have suffered extreme mass loss during its first giantstage, but not sufficient to reach the extreme horizontal branch.

A He-rich g-mode pulsator on the BHB