a weak tendency of larger amplitudes with increasing period may be visible. Considerably more LPVs with shorter periods were found in . In this galaxy, we also found a small group of stars with very long periods and small amplitudes. These are likely candidates for LSPs, but no other significant periodicities were found from our times series. Splitting up the stars according to their chemistry reveals a concentration of C-rich targets around $\log
P$=2.5, while the O-rich stars are found predominantly at shorter periods. This behaviour is expected from theory.

Period-luminosity relations {#PLR}
---------------------------

To construct period-luminosity diagrams (PLDs) for both target systems, and , the datasets of the $i$-time series and the $K_{s}$-band photometry were combined. This resulted in 182 LPVs with $K_{s}$-magnitudes and detected periods in and 387 LPVs in , respectively, which could be used for the construction of the PLDs. The resulting $K_{s}$-$\log{P}$ diagrams for both galaxies are shown in Fig.\[KlgP\]. Different symbols denote the various classes of LPVs, namely , , and unclassified variables according to the narrow-band photometry adopted from PaperI. Furthermore, the amplitude was used to group the variables into four sub-samples indicated by the symbol sizes in Fig.\[KlgP\]. Obviously, most LPVs in 