Visual Light from the Eclipsing Supersoft X-ray Source CAL 87

Schandl, S.; Meyer-Hofmeister, E.; Meyer, F.

doi:10.1007/978-94-009-0325-8_127

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“…The success of our model led us to calculate the light curve of CAL 87 if it would be seen under different inclinations. We found solutions similar to the light curves of RX J0019.8+2156 and CAL 83 (Schandl et al 1996).…”

Section: Introductionsupporting

confidence: 72%

“…It is the aim of our present investigation to determine a theoretical light curve for CAL 87, based on the model of vdH for steady nuclear burning on accreting white dwarfs. We model the contributions from the accretion disk, hot spot spray and the secondary star, each of them illuminated by the central hot white dwarf (see also Schandl et al 1996). Following the results of vdH we have a narrow range of possible mass accretion rates, white dwarf masses and secondary star masses.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of the visual light curve of CAL 87

Schandl

Meyer-Hofmeister

Meyer

Lecture Notes in Physics

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We model the visual light curve of CAL 87 based on the assumption that an accreting steadily burning white dwarf irradiates the accretion disk and the secondary star, as suggested by van den Heuvel et al. (1992). We use constraints on the geometry derived from the known orbital period. As sources of visual light we include the secondary star and an accretion disk with an optically thick, cold, clumpy spray at its riml presumably caused by an accretion stream of high mass flow rate impinging on the disk at the hot spot. This spray moving around the disk can account for the asymmetry in the light curve and the depth of the secondary minimum. It also might be the cause of the observed low X-ray luminosity if the white dwarf is permanently hidden by this disk.

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Section: Introductionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%