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Astron. Astrophys. 333, 565-570 (1998)

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3. The light curves

Fig. 2 clearly shows the gradual increase in visual magnitude V by about 0:m07 y-1 with associated reddening in [FORMULA], [FORMULA] and [FORMULA] (the latter amounting to about 0:m05 y-1) and cyclic microvariations. The brightening phase is strongly present in y, and decreases towards b and v. Superimposed on these longer-term trends are the microvariations (the so-called [FORMULA]  Cygni-type variations near the minimum of the SD cycle, see van Genderen et al. 1997a,b, and the longer [ [FORMULA] 100 d] cycles near maximum) and a much slower oscillation about the gradual, brightening trend. The data collected in 1996 show an apparently steep descent in y accompanied by a blueward shift in the [FORMULA] colour index. Note that this apparent steep descent could have been enhanced by a coincident descending part of the superimposed variability.

[FIGURE] Fig. 2. Differential [FORMULA] light curves of R 40 (P minus A) in the instrumental system ([FORMULA]). The top panel also contains the Walraven V magnitudes expressed in the Johnson scale. Filled triangles represent the 1995-1996 LTPV data

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© European Southern Observatory (ESO) 1998

Online publication: April 20, 1998