Studies of Two Post Common Envelope Binary Stars

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ID: 327735
2026
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Abstract
Abstract New time series photometry of the short period (P < 0.2 d) binary stars ZTF J032906.36+070408.3 (ZTF 0329) and ATO J090.7238+00.5996 (ATL 0602) is presented. The primary (hotter) stars in both systems are white dwarfs, while the cooler stars are M dwarfs. Archival photometry and new and archival spectra are used to derive the temperatures of the components in the two binaries. Both are single-lined binaries. Velocity curves are fitted to radial velocity measurements of the red dwarfs and used to place lower limits on the masses of the white dwarfs. New and archival time series photometry show evolution in the shapes of the light curves of both stars. Spectra of ZTF 0329 show an excess of radiation in the RC band which is ascribed to electron cyclotron radiation, suggesting that the star is a low accretion rate polar. Satisfactory model fits to the multi-filter light curves of ATL 0602 require the presence of cool spots on the red component of the binary. The latter star exhibits a variety of velocities associated with Balmer and Ca II emission lines within individual spectra.
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Authors C Koen, A. Knyazev
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1706
URL
https://doi.org/10.1093/mnras/stag1706
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