Context : Open clusters are excellent tracers of the structure , kinematics , and chemical evolution of the disc and a wealth of information can be derived from the spectra of their constituent stars .

Aims : We investigate the nature of the chemical composition of the outer disc open cluster Tombaugh 2 .
This has been suggested to be a member of the GASS/Mon substructure , and a recent study by Frinchaboy et al .
( 2008 ) suggested that this was a unique open cluster in possessing an intrinsic metal abundance dispersion .
We aim to investigate such claims .

Methods : High resolution VLT+GIRAFFE spectra in the optical are obtained and analyzed for a number of stars in the Tombaugh 2 field , together with independent UBVI _ { C } photometry .
Radial velocities and position in the color-magnitude diagram are used to assess cluster membership .
The spectra , together with input atmospheric parameters and model atmospheres , are used to determine detailed chemical abundances for a variety of elements in 13 members having good spectra .

Results : We find the mean metallicity to be [ Fe/H ] = -0.31 \pm 0.02 with no evidence for an intrinsic abundance dispersion , in contrary to the recent results of Frinchaboy et al .
( 2008 ) .
We find Ca and Ba to be slightly enhanced while Ni and Sc are solar .
The r-process element Eu was found to be enhanced , giving an average [ Eu/Ba ] =+0.17 .
The Li abundance decreases with T _ { eff } on the upper giant branch and maintains a low level for red clump stars .
The mean metallicity we derive is in good agreement with that expected from the radial abundance gradient in the disc for a cluster at its Galactocentric distance .

Conclusions : Tombaugh 2 is found to have abundances as expected from its Galactocentric distance and no evidence for any intrinsic metallicity dispersion .
The surprising result found by Frinchaboy et al .
( 2008 ) , that is the presence of 2 distinct abundance groups within the cluster , implying either a completely unique open cluster with an intrinsic metallicity spread , or a very unlikely superposition of a cold stellar stream and a very distant open cluster , is not supported by our new result .