We present results of our study on eight dense cores , previously classified as starless , using infrared ( 3-160 µm ) imaging observations with AKARI telescope and molecular line ( HCN and N _ { 2 } H ^ { + } ) mapping observations with KVN telescope .
Combining our results with the archival IR to mm continuum data , we examined the starless nature of these eight cores .
Two of the eight cores are found to harbor faint protostars having luminosity of \sim 0.3 - 4.4 L _ { \odot } .
The other six cores are found to remain as starless and probably are in a dynamically transitional state .
The temperature maps produced using multi-wavelength images show an enhancement of about 3-6 K towards the outer boundary of these cores , suggesting that they are most likely being heated externally by nearby stars and/or interstellar radiation fields .
Large virial parameters and an over-dominance of red asymmetric line profiles over the cores may indicate that the cores are set into either an expansion or an oscillatory motion , probably due to the external heating .
Most of the starless cores show coreshine effect due to the scattering of light by the micron-size dust grains .
This may imply that the age of the cores is of the order of \sim 10 ^ { 5 } years , being consistent with the timescale required for the cores to evolve into an oscillatory stage due to the external perturbation .
Our observational results support the idea that the external feedback from nearby stars and/or interstellar radiation fields may play an important role in the dynamical evolution of the cores .