Abstract:
Bright-rimmed clouds(BRCs) are excellent laboratoriesto explore the radiation-driven implosion mode ofstar formation because
they show evidence of triggered star formation. In our previous study, BRC 18 has been found to accelerate away from the
direction of the ionizing H II region because of the well-known ‘Rocket Effect’. Based on the assumption that both BRC 18 and
the candidate young stellar objects (YSOs) are kinematically coupled and using the latest Gaia EDR3 measurements, we found
that the relative proper motions of the candidate YSOs exhibit a tendency of moving away from the ionizing source. Using BRC
18 as a prototype, we made our further analysis for 21 more BRCs, a majority of which showed a similar trend. For most of the
BRCs, the median angle of the relative proper motion of the candidate YSOs is similar to the angle of on-sky direction from
the ionizing source to the central IRAS source of the BRC. Based on the Pearson’s and Spearman’s correlation coefficients, we
found a strong correlation between these two angles, which is further supported by the Kolmogorov–Smirnov (K−S) test on
them. The strong correlation between these two angles supports the ‘Rocket Effect’ in the BRCs on the sky plane.
