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Astron. Astrophys. 342, L45-L48 (1999)

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4. Optical variability

In Fig. 2 we show the R and I light curves obtained in the first 3 nights, together with those of stars #2 and #3. The latter two do not show any sign of variability, with [FORMULA] upper limits to random peak-to-peak variability of [FORMULA] mag and [FORMULA] mag for star 3, and [FORMULA] mag and [FORMULA] mag for star 2. V592 Her on the other hand, shows 98.9% significant variability in R with a standard deviation of [FORMULA] mag ([FORMULA] upper limit to random peak-to-peak variability of [FORMULA] mag). There is no sign of any systematic variability such as an orbital modulation, and the variability in R looks more like random flickering. Because V592 Her is much fainter in I we can only put a [FORMULA] upper limit of [FORMULA] mag.

[FIGURE] Fig. 2a and b. R and I light curves of V592 Her and the neighbouring comparison stars 2 and 3. UT time is measured in hours from JD 2450 662.5

Howell et al. (1991) report much larger-amplitude flickering ([FORMULA] mag in wide R) from Duerbeck's star #1 (assuming that their identification refers to the publeshed coordinates).

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© European Southern Observatory (ESO) 1999

Online publication: February 23, 1999
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