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We obtained BVIc photometry of IRC-10443 on 85 different nights distributedover two years, and in addition low resolution absolute spectro- photometry andhigh resolution Echelle spectroscopy. Our data show that IRC-10443, which wasnever studied before in any detail, is a SRa variable, characterized byDelta(B)=1.27, Delta(V)=1.14 and Delta(I)=0.70 mag amplitudes and mean values<B>=13.75, <V>=11.33 and <Ic>=6.18 mag. Two strong periodicities aresimultaneously present: a principal one of 85.5 (+/-0.2) days, and a secondaryone of 620 (+/-15) days, both sinusoidal in shape, and with semi-amplitudesDelta(V)=0.41 and 0.20 mag, respectively. IRC-10443 turns out to be a M7IIIstar, with a mean heliocentric radial velocity -28 km/s and reddened byE(B-V)=0.87, a third of which of circumstellar origin. The same 0.5 kpcdistance is derived from application of the appropriate period-luminosityrelations to both the principal and the secondary periods. The long secondaryperiod causes a sinusoidal variation in color of 0.13 mag semi-amplitude inV-Ic, with IRC-10443 being bluest at maximum and reddest at minimum, and withassociated changes in effective temperature and radius of 85 K and 6%,respectively. This behavior of colors argues in favor of a pulsation nature forthe still mysterious long secondary periods in AGB stars.

IRC-10443: a multi-periodic SRa variable and the nature of long secondary periods in AGB stars