Spectroscopic and photometeric study of NT Aps – a low-activity W UMa-type contact binary

• DOI: 10.1017/pasa.2024.122
• Publication Date: 2025-01-31T06:40:18Z
• Authors: Antoaneta Avramov...; Antoaneta Antonova; Heidi Korhonen; Ivanka Stateva; S. Stefanov
• Keywords: Contact binary

Abstract We have carried out a detailed investigation of eclipsing binary star NT Aps using high cadence photometric observations from the TESS satellite and time-series spectra EFOSC2 at ESO’s New Technology Telescope. have, for first time, determined precise system parameters this W UMa-type late-type contact binary. Our analysis indicates that is composed two solar-like stars with mass ratio $q=0.31$ orbital period 0.29475540 $\pm$ 0.00000035 days. These values are typical common envelope binaries. However, does not exhibit strong magnetic activity in form frequent flaring large starspots, even if flare rates been earlier predicted system. This lack further strengthens indications binaries less magnetically active than those detached chromospherically similar parameters.