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With now more than 20 exoplanets discovered by CoRoT, it has often beenconsidered strange that so many of them are orbiting F-stars, and so few ofthem K or M-stars. Although transit search programs are mostly sensitive toshort-period planets, they are ideal for verifying these results. To determinethe frequency of planets as a function of stellar mass, we also have tocharacterize the sample of stars that was observed. We study the stellarcontent of the CoRoT-fields IRa01, LRa01 (=LRa06), and LRa02 by determining thespectral types of 11466 stars. We used spectra obtained with the multi-objectspectrograph AAOmega and derived the spectral types by using template spectrawith well-known parameters. We find that 34.8+/-0.7% of the stars observed byCoRoT in these fields are F-dwarfs, 15.1+/-0.5% G-dwarfs, and 5.0+/-0.3%K-dwarfs. We conclude that the apparent lack of exoplanets of K- and M-stars isexplained by the relatively small number of these stars in the observed sample.We also show that the apparently large number of planets orbiting F-stars issimilarly explained by the large number of such stars in these fields. Ourstudy also shows that the difference between the sample of stars that CoRoTobserves and a sample of randomly selected stars is relatively small, and thatthe yield of CoRoT specifically is the detection one hot Jupiter amongst2100+/-700 stars. We conclude that transit search programs can be used to studythe relation between the frequency of planets and the mass of the host stars,and that the results obtained so far generally agree with those of radialvelocity programs.

Multi-object spectroscopy of stars in the CoRoT fields II: The stellar population of the CoRoT fields IRa01, LRa01, LRa02, and LRa06