Issue |
A&A
Volume 688, August 2024
|
|
---|---|---|
Article Number | A58 | |
Number of page(s) | 7 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361/202450203 | |
Published online | 01 August 2024 |
ZTF J185259.31+124955.2: A new evolved disc-eclipsing binary system
1
Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.V. (BAV), Munsterdamm 90, 12169 Berlin, Germany
e-mail: klaus.bernhard@liwest.at
2
Department of Physics and Astronomy, University of Sussex, Brighton BN19QH, UK
e-mail: C.Lloyd@sussex.ac.uk
Received:
1
April
2024
Accepted:
20
May
2024
Discs in long-period eclipsing binary systems are rare and can lead to extraordinary eclipsing events. ZTF J185259.31+124955.2 was identified as a candidate disc-eclipsing system through a continuing search programme of ZTF variables with a near-IR excess in the WISE data. Examination of the combined ZTF and ATLAS photometry shows seven eclipses since 2017 with depths of 0.m34 in all bands on a period of 289.57 ± 0.09 d. The eclipse width is ∼40 d but this and the profile evolve over time. Comparison with library spectra shows that the spectral energy distribution from the available photometry is consistent with an early K-type giant, and fitting black-body profiles suggests Teff ∼ 4000 K for the stellar component, with a cool component having Teff < 500 K. The reddening and distance, and hence the luminosity place the star within the giant branch. The most likely scenario is that the system is in a state of rapid evolution following Case B/C mass transfer into an extended disc around an unseen companion.
Key words: stars: AGB and post-AGB / binaries: eclipsing / circumstellar matter / stars: evolution / stars: individual: ZTF J185259.31+124955.2
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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