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Context. The formation and early evolution of high- and intermediate-massstars towards the main sequence involves the interplay of stars in a clusteredand highly complex environment. To obtain a full census of this interaction,the Formation and Early evolution of Massive Stars (FEMS) collaboration studiesa well-selected sample of 10 high-mass star-forming regions. Aims. In thisstudy we examine the stellar content of the high-mass star-forming regioncentered on IRAS 06084-0611 in the Monoceros R2 cloud. Methods. Using thenear-infrared H- and K-band spectra from the VLT/SINFONI instrument on the ESOVery Large Telescope (VLT)and photometric near-infrared NTT/SOFI, 2MASS andSpitzer/IRAC data, we were able to determine the spectral types for the mostluminous stars in the cluster. Results. Two very young and reddened massivestars have been detected by SINFONI: a massive Young Stellar Object (YSO) con-sistent with an early-B spectral type and a Herbig Be star. Furthermore, starsof spectral type G and K are detected while still in the Pre-Main Sequence(PMS) phase. We derive additional properties such as temperatures, extinctions,radii and masses. We present a Hertzsprung-Russell diagram and find mostobjects having intermediate masses between \sim1.5-2.5 M\odot. For these starswe derive a median cluster age of \sim4 Myr. Conclusions. Using Spitzer/IRACdata we confirm earlier studies that the younger class 0/I objects arecentrally located while the class II objects are spread out over a larger area,with rough scale size radii of \sim0.5 pc and \sim1.25 pc respectively.Moreover, the presence of a massive YSO, an ultracompact H ii region and highlyreddened objects in the center of the cluster suggest a much younger age of < 1Myr. A possible scenario for this observation would be sequential starformation along the line of sight; from a cluster of intermediate-mass tohigh-mass stars.

Sequential star formation in IRAS 06084-0611 (GGD 12-15): From intermediate-mass to high-mass stars