  gamma Dor-type oscillations have been discovered in the star HD218427 through
simultaneous uvby photometric observations carried out in the year 2003. A few
Hbeta-Crawford measurements were also collected for calibration purposes which
place this star well-located inside the gamma Dor instability region.
Deficiency in metal content, similar to other well-defined gamma Dor stars, is
found in HD218427 and the possibility of a lambda Boo nature is discussed.
Frequency analysis was carried out for different filters, the combined "vby"
filter was also used and five frequencies were found as significant with
periods ranging between 0.3 and 0.8 days. The recently developed Frequency
Ratio Method is used in order to perform an identification of the excited
modes. The results are consistent with an l=2 identification for all the modes
and high radial quantum numbers (n~40) for the three main observed
periodicities. The possibility of multiplet structures is also discussed.
However, no consistency is found when the Time-Dependent Convection treatment
is used for modes discrimination. The disagreement can be due to the large
rotation velocity taking place in HD218427 and, consequently, the significant
coupling between the modes.
