A new class of rapidly pulsating star -- IV. Oscillations in EC 20117 -- 4014 and atmospheric analyses

Publisher Website
Google Scholar
Abstract
A new class of pulsating stars, the EC 14026 stars, has recently been announced. We report the discovery of rapid oscillations in EC 20117 — 4014. The oscillations are multiperiodic with three periods detected so far: 137.3, 142.1 and 158.7 s. The peak-to-peak amplitude of these oscillations is ∼ 1 per cent. Along with the spectrum and UBV colours, this implies that EC 20117 — 4014 is another member of the new class. Interestingly, there is evidence for period/phase changes in the main 137.3-s period, as no linear ephemeris can be found that will fit the collection of light curves we have obtained. We interpret the oscillations as pulsations of an sdB star in a binary with an F/G companion, as indicated by the optical spectra.

This publication has 0 references indexed in Scilit: