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We present Atacama Large Millimeter/sub-millimeter Array (ALMA) observationstowards 27 low-redshift ($0.02< z<0.2$) star-forming galaxies taken from theValpara\'iso ALMA/APEX Line Emission Survey (VALES). We perform stackinganalyses of the $^{12}$CO($1-0$), $^{13}$CO($1-0$) and C$^{18}$O($1-0$)emission lines to explore the $L'$ ($^{12}$CO($1-0$))/$L'$($^{13}$CO($1-0$)))(hereafter $L'$($^{12}$CO)/$L'$($^{13}$CO)) and$L'$($^{13}$CO($1-0$))/$L'$(C$^{18}$O($1-0$)) (hereafter$L'$($^{13}$CO)/$L'$(C$^{18}$O) line luminosity ratio dependence as a functionof different global galaxy parameters related to the star formation activity.The sample has far-IR luminosities $10^{10.1-11.9}$L$_{\odot}$ and stellarmasses of $10^{9.8-10.9}$M$_{\odot}$ corresponding to typical star-forming andstarburst galaxies at these redshifts. On average we find a$L'$($^{12}$CO)/$L'$($^{13}$CO) line luminosity ratio value of 16.1$\pm$2.5.Galaxies with evidences of possible merging activity tend to show higher$L'$($^{12}$CO)/$L'$($^{13}$CO) ratios by a factor of two, while variations ofthis order are also found in galaxy samples with higher star formation rates orstar formation efficiencies. We also find an average$L'$($^{13}$CO)/$L'$(C$^{18}$O) line luminosity ratio of 2.5$\pm$0.6, which isin good agreement with those previously reported for starburst galaxies. Wefind that galaxy samples with high $L_{\text{IR}}$, SFR and SFE show low$L'$($^{13}$CO)/$L'$(C$^{18}$O) line luminosity ratios with high$L'$($^{12}$CO)/$L'$($^{13}$CO) line luminosity ratios, suggesting that thesetrends are produced by selective enrichment of massive stars in youngstarbursts.

VALES VI: ISM enrichment in star-forming galaxies up to z$\sim$0.2 using $^{12}$CO(1-0), $^{13}$CO(1-0) and C$^{18}$O(1-0) line luminosity ratios