Sh2-205: II. Its quiescent stellar formation activity

TL;DR

This study investigates star formation activity around the HII region Sh2-205 using multi-wavelength data, identifying potential stellar formation sites and suggesting triggered star formation via the 'collect and collapse' process.

Contribution

It provides new insights into the star formation activity near Sh2-205 and demonstrates the potential of the 'collect and collapse' model in explaining triggered star formation.

Findings

Active star formation candidates are associated with molecular gas in LBN 148.11-0.45.

Some candidates lack molecular gas, raising questions about their nature.

The 'collect and collapse' model supports triggered star formation in the region.

Abstract

We present a study of active stellar forming regions in the environs of the HII region Sh2-205. The analysis is based on data obtained from point source catalogues and images extracted from 2MASS, MSX, and IRAS surveys. Complementary data are taken from CO survey. The identification of primary candidates to stellar formation activity is made following colour criteria and the correlation with molecular gas emission. A number of stellar formation tracer candidates are projected on two substructures of the HII region: SH148.83-0.67 and SH149.25-0.00. However, the lack of molecular gas related to these structures casts doubts on the nature of the sources. Additional infrared sources may be associated with the HI shell centered at (l,b) = (149\degr 0\arcmin, -1\degr 30\arcmin). The most striking active area was found in connection to the HII region LBN 148.11-0.45, where stellar formation candidates are projected onto molecular gas. The analytical model to the "collect and collapse" process shows that stellar formation activity could have been triggered by the expansion of this HII region.