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arXiv · 2610.26957

On the Nature of the BeWD System Nova FQ Circinus

Shatakshi Chamoli·Philip A. Charles·Judhajeet Basu·G. C. Anupama·Sudhanshu Barway·Przemek Mróz
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Abstract

The classical nova FQ Cir (Schaefer et al. 2026) has recently been shown to have a Be star donor, and has been identified as a High Mass Cataclysmic Variable (HMCV), with an orbital period of $\sim 2.04d$ (twice the 1.02d periodogram peak). Using the extensive OGLE optical archive, together with existing observations from ASAS-SN we instead find significant modulation between $\sim 50-60$~days and propose that the orbital period is likely closer to $\sim 62d$. We interpret the low amplitude 1.02 d modulation as a non-radial pulsation of the Be star. We also reassess the HMCV classification based on properties of known Be star-white dwarf systems.

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Shatakshi Chamoli, Philip A. Charles, Judhajeet Basu, G. C. Anupama, Sudhanshu Barway, Przemek Mróz. 2026-10-18. On the Nature of the BeWD System Nova FQ Circinus. https://arxiv.org/abs/2610.26957

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