  We present near infrared velocity curves for 12 long period variables (LPVs)
in the globular cluster 47 Tuc (NGC 104). New light curves are also presented
for these variables. Results are compared with the period-luminosity sequences
occupied by the LPVs in the LMC. Sequence C variables (fundamental mode
pulsators) have larger velocity amplitudes than sequence B variables (first
overtone pulsators). We show that, at similar luminosities, higher mass loss
rates are associated with larger pulsation amplitudes. One variable (V18) does
not fit the normal period luminosity sequences and it has an unusually large
amount of circumstellar dust, suggesting that it has recently undergone a
thermal pulse on the AGB. Finally, we report the discovery of three new long
period variable stars in the cluster core, all previously found to have a large
infrared excess.
