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We present a set of 87 RAVE stars with detected solar like oscillations,observed during Campaign 1 of the K2 mission (RAVE K2-C1 sample). This datasetprovides a useful benchmark for testing the gravities provided in RAVE DataRelease 4 (DR4), and is key for the calibration of the RAVE Data Release 5(DR5). In the present work, we use two different pipelines, GAUFRE (Valentiniet al. 2013) and Sp_Ace (Boeche & Grebel 2016), to determine atmosphericparameters and abundances by fixing log(g) to the seismic one. Our strategyensures highly consistent values among all stellar parameters, leading to moreaccurate chemical abundances. A comparison of the chemical abundances obtainedhere with and without the use of seismic log(g) information has shown that anunderestimated (overestimated) gravity leads to an underestimated(overestimated) elemental abundance (e.g. [Mg/H] is underestimated by ~0.25 dexwhen the gravity is underestimated by 0.5 dex). We then perform a comparisonbetween the seismic gravities and the spectroscopic gravities presented in theRAVE DR4 catalogue, extracting a calibration for log(g) of RAVE giants in thecolour interval 0.50<(J - Ks)<0.85. Finally, we show a comparison of thedistances, temperatures, extinctions (and ages) derived here for our RAVE K2-C1sample with those derived in RAVE DR4 and DR5.DR5 performs better than DR4thanks to the seismic calibration, although discrepancies can still beimportant for objects for which the difference between DR4/DR5 and seismicgravities differ by more than ~0.5 dex. The method illustrated in this workwill be used for analysing RAVE targets present in the other K2 campaigns, inthe framework of Galactic Archaeology investigations.

RAVE stars in K2 - I. Improving RAVE red giants spectroscopy using asteroseismology from K2 Campaign 1