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We present a sample of about 120,000 red clump candidates selected from theLAMOST DR2 catalog based on the empirical distribution model in the effectivetemperature vs. surface gravity plane. Although, in general, red clump starsare considered as the standard candle, they do not exactly stay in a narrowrange of absolute magnitude, but may extend to more than 1 magnitude dependingon their initial mass. Consequently, conventional oversimplified distanceestimations with assumption of fixed luminosity may lead to systematic biasrelated to the initial mass or the age, which may potentially affect the studyof the evolution of the Galaxy with red clump stars. We therefore employ anisochrone-based method to estimate the absolute magnitude of red clump starsfrom their observed surface gravities, effective temperatures, andmetallicities. We verify that the estimation well removes the systematics andprovide an initial mass/age independent distance estimates with accuracy lessthan 10%.

Red Clump Stars from the LAMOST data I: identification and distance