  Chemical compositions are derived from high-resolution spectra for five field
SRd variables. These supergiants not previously analysed are shown to be
metal-poor: KK Aql with [Fe/H] = -1.2, AG Aur with [Fe/H] = -1.8, Z Aur with
[Fe/H] = -1.4, W LMi with [Fe/H] = -1.1, and WW Tau with [Fe/H] = -1.1. Their
compositions are, except for two anomalies, identical to within the measurement
errors with the compositions of subdwarfs, subgiants, and less evolved giants
of the same [Fe/H]. One anomaly is an s-process enrichment for KK Aql, the
first such enrichment reported for a SRd variable. The second and more
remarkable anomaly is a strong lithium enrichment for W LMi, also a first for
field SRds. The Li I 6707 A profile is not simply that of a photospheric line
but includes strong absorption from red-shifted gas, suggesting, perhaps, that
lithium enrichment results from accretion of Li-rich gas. This potential clue
to lithium enrichment is discussed in light of various proposals for lithium
synthesis in evolved stars.
