The Iron Yield of Normal Type II Supernovae
  We present $^{56}$Ni mass estimates for 110 normal Type II supernovae (SNe
II), computed here from their luminosity in the radioactive tail. This sample
consists of SNe from the literature, with at least three photometric
measurements in a single optical band within 95-320 d since explosion. To
convert apparent magnitudes to bolometric ones, we compute bolometric
corrections (BCs) using 15 SNe in our sample having optical and near-IR
photometry, along with three sets of SN II atmosphere models to account for the
unobserved flux. We find that the $I$- and $i$-band are best suited to estimate
luminosities through the BC technique. The $^{56}$Ni mass distribution of our
SN sample has a minimum and maximum of 0.005 and 0.177 M$_{\odot}$,
respectively, and a selection-bias-corrected average of $0.037\pm0.005$
M$_{\odot}$. Using the latter value together with iron isotope ratios of two
sets of core-collapse (CC) nucleosynthesis models, we calculate a mean iron
yield of $0.040\pm0.005$ M$_{\odot}$ for normal SNe II. Combining this result
with recent mean $^{56}$Ni mass measurements for other CC SN subtypes, we
estimate a mean iron yield $<$0.068 M$_{\odot}$ for CC SNe, where the
contribution of normal SNe II is $>$36 per cent. We also find that the
empirical relation between $^{56}$Ni mass and steepness parameter ($S$) is
poorly suited to measure the $^{56}$Ni mass of normal SNe II. Instead, we
present a correlation between $^{56}$Ni mass, $S$, and absolute magnitude at 50
d since explosion. The latter allows to measure $^{56}$Ni masses of normal SNe
II with a precision around 30 per cent.
