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Context. The Gum 31 bubble containing the stellar cluster NGC 3324 is apoorly-studied young region close to the Carina Nebula.  Aims. We are aiming to characterise the young stellar and protostellarpopulation in and around Gum 31 and to investigate the star-formation processin this region.  Methods. We identify candidate young stellar objects from Spitzer, WISE, andHerschel data. Combining these, we analyse the spectral energy distributions ofthe candidate young stellar objects. With density and temperature maps obtainedfrom Herschel data and comparisons to a 'collect and collapse' scenario for theregion we are able to further constrain the characteristics of the region as awhole.  Results. 661 candidate young stellar objects are found from WISE data, 91protostar candidates are detected through Herschel observations in a 1.0 deg x1.1 deg area. Most of these objects are found in small clusters or are wellaligned with the H II bubble. We also identify the sources of Herbig-Haro jets.The infrared morphology of the region suggests that it is part of the largerCarina Nebula complex.  Conclusions. The location of the candidate young stellar objects in the rimof the H II bubble is suggestive of their being triggered by a 'collect andcollapse' scenario, which agrees well with the observed parameters of theregion. Some candidate young stellar objects are found in the heads of pillars,which points towards radiative triggering of star formation. Thus, we findevidence that in the region different mechanisms of triggered star formationare at work. Correcting the number of candidate young stellar objects forcontamination we find ~ 600 young stellar objects in Gum 31 above ourcompleteness limit of about 1 M_sol. Extrapolating the intital mass functiondown to 0.1 M_sol, we estimate a total population of ~ 5000 young stars for theregion.

Discovering young stars in the Gum 31 region with infrared observations