Apparent \oiii variability in the narrow line Seyfert I Mrk142
  In this letter, we checked spectral properties of the well-known narrow line
Seyfert I Mrk142, in order to try to find effects of narrow line variability on
BLR radius of Mrk142 which is an outlier in the R-L plane. Although, no
improvement can be found on BLR radius, apparent narrow line variability can be
confirmed in Mrk142. Using the public spectra collected from the Lick AGN
Monitoring Project, the spectral scaling method based on assumption of constant
\oiii line is firstly checked by examining broad and narrow emission line
properties. We find that with the application of the spectral scaling method,
there is a strong correlation between the \oiii line flux and the \oiii line
width, but weaker correlations between the broad H$\alpha$ flux and the broad
H$\beta$ flux, and between the broad H$\alpha$ flux and the continuum emission
at 5100\AA. The results indicate that the assumption of constant \oiii line is
not preferred, and caution should be exercised when applying the spectral
scaling calibration method. And then, we can find a strong correlation between
the \oiii line flux and the continuum emission at 5100\AA, which indicates
apparent short-term variability of the \oiii line in Mrk142 over about two
months.
