The very young open cluster NGC 1893 sports five O-type stars (the five brightest stars across the center of the cluster in front of the nebula). The cluster also produced a number of hot B-type stars. Together, these stars (especially the O-type stars) power the glowing gas behind them. See especially this study: https://arxiv.org/pdf/astro-ph/0703706.pdf
Infrared and X-ray images of the area show more stars behind the the dark clouds of gas and dust that cross the face of the nebula. https://arxiv.org/pdf/0807.0116.pdf Studies also strongly suggest that NGC 1893 harbors many pre-main-sequence stars and some protostars, https://arxiv.org/pdf/0707.0269.pdf, and young stellar objects, https://arxiv.org/pdf/1207.5632.pdf. The cluster is probably 4-5 million years old, though star formation is probably ongoing.
The two cometary globules (or tadpole nebulae) are from left to right Simeis 129 and 130. The nebula behind the cluster is called IC 410.
This image is 63x15" (15.75 hours) with the 203mm f/4.95 Synta-ONTC Newtonian, an Astronomik CLS filter, and Atik 460 EXC camera.
