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In this paper we present for the first time, the study of low resolution $H$-and $K$- band spectra of 7 DY\,Per type and suspects stars as well asDY\,Persei itself. We also observed $H$- and $K$- band spectra of 3 R CoronaeBorealis (RCB) stars, 1 hydrogen-deficient carbon (HdC) star and 14 cool carbonstars including normal giants as comparisons. High $^{12}$C/$^{13}$C and low$^{16}$O/$^{18}$O ratios are characteristic features of majority RCBs and HdCs.We have estimated $^{16}$O/$^{18}$O ratios of the programme stars from therelative strengths of the $^{12}$C$^{16}$O and $^{12}$C$^{18}$O molecular bandsobserved in $K$- band. Our preliminary analysis suggest that a quartet of theDY\,Per suspects along with DY\,Persei itself seems to show isotopic ratiostrength consistent with the ones of RCB/HdC stars whereas two of them do notshow significant $^{13}$C and $^{18}$O in their atmospheres. Our analysisprovides further indications that DY\,Per type stars could be related toRCB/HdC class of stars.

Are DY\,Persei stars cooler cousins of R Coronae Borealis stars?