New Young Star Candidates in BRC 27 and BRC 34

TL;DR

This study used archival Spitzer data to identify new young stellar object candidates in BRC 27 and BRC 34, revealing active star formation possibly triggered by nearby OB stars, and expanding the known YSO populations.

Contribution

It presents new YSO candidates in BRC 27 and BRC 34 based on infrared excesses, enhancing understanding of star formation in these regions.

Findings

22 YSOs in BRC 27 show IR excesses

16 new YSO candidates identified in BRC 27

13 new YSO candidates in BRC 34, including a Class I object

Abstract

We used archival Spitzer Space Telescope mid-infrared data to search for young stellar objects (YSOs) in the immediate vicinity of two bright-rimmed clouds, BRC 27 (part of CMa R1) and BRC 34 (part of the IC 1396 complex). These regions both appear to be actively forming young stars, perhaps triggered by the proximate OB stars. In BRC 27, we find clear infrared excesses around 22 of the 26 YSOs or YSO candidates identified in the literature, and identify 16 new YSO candidates that appear to have IR excesses. In BRC 34, the one literature-identified YSO has an IR excess, and we suggest 13 new YSO candidates in this region, including a new Class I object. Considering the entire ensemble, both BRCs are likely of comparable ages, within the uncertainties of small number statistics and without spectroscopy to confirm or refute the YSO candidates. Similarly, no clear conclusions can yet be drawn about any possible age gradients that may be present across the BRCs.