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Next: HIPPARCOS data Up: Period analyses Previous: HD 220391

ESO and Geneva data

245 observations were obtained during the two last seasons only, spanning 14 nights. We note the much smaller standard deviation of 0.0061 mag in the measurements. Again the data obtained on JD 8518 are conspicuously low : the same effect as in the former case was detected, implying an artificial increase in standard deviation of order 0.001 mag. A frequency search was performed in a similar way as for HD 220392: only one peak at the frequency 0.42 cpd was found. However, the associated amplitude is below the expected noise level and the reduction of the standard deviation is only 19%. Additional observation campaigns should be undertaken in the southern hemisphere to investigate the existence of such a frequency.

Figure 6: Phase diagram for the HIP 115510-data against the frequency f1 (4.67439 cpd)
\includegraphics[bb=89 56 548 612,clip,height=80mm,angle=-90]{hr8895fig2.eps}

Wolfgang Zima