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1990•Monthly Notices of the Royal Astronomical SocietyOpen access

Secular brightness variation of the dwarf nova Z Cha during quiescence ⋆

S. van Amerongen, E. Kuulkers, J. van Paradijs

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Abstract

We report results of long-term optical photometry of the dwarf nova Z Cha made during two quiescent intervals. We find that the brightness of the ‘hot spot’ increases between two outbursts. This is consistent with the decrease of the outer disc radius previously reported by O’Donoghue. The fluxes of the accretion disc and of the white dwarf do not show a secular trend between outbursts. This result, which reinforces a similar result obtained from long-term observations of VW Hyi, seems hard to reconcile with current versions of the disc-instability model for dwarf-nova outbursts.

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We report results of long-term optical photometry of the dwarf nova Z Cha made during two quiescent intervals. We find that the brightness of the ‘hot spot’ increases between two outbursts. This is consistent with the decrease of the outer disc radius previously reported by O’Donoghue. The fluxes of the accretion disc and of the white dwarf do not show a secular trend between outbursts. This result, which reinforces a similar result obtained from long-term observations of VW Hyi, seems hard to reconcile with current versions of the disc-instability model for dwarf-nova outbursts.

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Available abstract

We report results of long-term optical photometry of the dwarf nova Z Cha made during two quiescent intervals. We find that the brightness of the ‘hot spot’ increases between two outbursts. This is consistent with the decrease of the outer disc radius previously reported by O’Donoghue. The fluxes of the accretion disc and of the white dwarf do not show a secular trend between outbursts. This result, which reinforces a similar result obtained from long-term observations of VW Hyi, seems hard to reconcile with current versions of the disc-instability model for dwarf-nova outbursts.

Key concepts: Physics, Dwarf nova, Astrophysics, Photometry (optics), Brightness, White dwarf, Astronomy, Accretion disc

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