  Effective temperatures, surface gravities, and iron abundances were derived
for 109 stars observed by the K2 mission using equivalent width measurements of
Fe I and Fe II lines. Calculations were carried out in LTE using Kurucz model
atmospheres. Stellar masses and radii were derived by combining the stellar
parameters with Gaia DR3 parallaxes, V-magnitudes, and isochrones. The derived
stellar and planetary radii have median internal precision of 1.8%, and 2.3%,
respectively. The radius gap near $\rm R_{planet}\sim 1.9 R_\oplus$ was
detected in this K2 sample. Chromospheric activity was measured from the Ca II
H and K lines using the Values of $\log R^\prime_{\rm HK}$ were investigated as
a function of stellar rotational period (P$_{rot}$) and we found that
chromospheric activity decreases with increasing P$_{rot}$, although there is a
large scatter in $\log R^\prime_{\rm HK}$ ($\sim$0.5) for a given P$_{rot}$.
Activity levels in this sample reveal a paucity of F & G dwarfs with
intermediate activity levels (Vaughan-Preston gap). The effect that stellar
activity might have on the derivation of stellar parameters was investigated by
including magnetically-sensitive Fe I lines in the analysis and we find no
significant differences between parameters with and without
magnetically-sensitive lines, although the more active stars ($\log R^\prime
_{\rm HK}>-5.0$) exhibit a larger scatter in the differences in $T_{\rm eff}$
and [Fe/H].
