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A number of empirical correlations that allows us to calculate the effectivetemperature and surface gravity for a set evolved post-AGB and RV Tauri starsare determined using as calibrators the intrinsic colours of 2MASS (Two MicronAll Sky Survey) photometry. We have analyzed a total sample of 36 stars where25 are post-AGB stars and 11 are RV Tauri stars, respectively. A group of 11stars with parallaxes measures were used as calibrators of the absolutemagnitude. The result for T$_{\rm eff}$ and log g from intrinsic colours(J-H)$_{0}$ and (H-K$_{s}$)$_{0}$ at the near-infrared pass bands reach adispersion of 220 K and 0.27, respectively. We can estimate the absolutemagnitude using the intrinsic colour in the near-infrared band with anuncertainty of 0.28 mag. This indicates that (J-H)$_{0}$ and (H-K$_{s}$)$_{0}$show sensitivity to the absolute magnitude.

An approach to effective temperature and surface gravity in post-AGB and RV Tauri stars at the near-IR region