An optical and near-infrared exploration of the star formation region in Cygnus surrounding RNO 127

Abstract

Abstract. We investigate a relatively unstudied star formation region in Cygnus centered on RNO 127, finding numerous Herbig-Haro flows, many identified in optical [SII], Hα, and near-infrared H 2 tracers of shock waves. Several protostars and young stars are thus located, including one conspicuously brightened object, which illuminates a variable reflection nebula. In total, the coordinates of 17 optical HH knots and jets, 4 associated cometary nebulae and 3 NIR objects are given. Individual structures are discussed including a central complex which has the characteristics of superposed HH flows. This star-forming cloud is not isolated but is part of a much larger region of distributed star formation, including HH 380 and HH 381.

A wide-field near-infrared H22.122μm line survey of the Braid Nebula star formation region in Cygnus OB7

“…Figure C.4 shows the region around MHO 911 and the optical knots that comprise HH 627, which were first detected by Movsessian et al (2003). The overall bow-shock shape of MHO 911 suggests that it is driven by a source situated to the NW, where the CSO 1.1 mm core #51 is located (Aspin et al 2011).…”

“…In our analysis of the Braid Nebula region we compared nearinfrared H 2 1−0 S(1) line data with optical Hα, [SII] and CSO 1.1 mm observations that were presented and thoroughly described in Magakian et al (2010) and Aspin et al (2011) Movsessian et al (2003). In the online version, the left panel shows a colour composite view constructed from DSS 2 Blue (blue), DSS 2 Red (green) and DSS 2 Infrared (red) images.…”

“…C.6 is also host to a prominent optical and near-infrared flow, MHO 926 (HH 634). MHO 926 consists of a chain of well-defined bows connecting with MHO 923A and B (Movsessian et al 2003). It seems clear that the bipolar outflow MHO 926 to 923A,B is being powered by a source associated with the 1.1 mm core #33.…”

“…Further spectroscopic observations supported this interpretation (Greene et al 2008) and a subsequent comparison of archival optical data from DSS-1 (1953) and DSS-2 (1990) with more recent CCD images demonstrated that HH 381 IRS had brightened considerably over the last few decades. The presence of two FU Ori type outburst stars in LDN 1003, along with numerous IRAS sources (Movsessian et al 2003), points to significant star formation activity in this area. A follow-up unbiased, wide-field and multi-waveband study of the region was warranted; this is a project that our consortium is currently conducting.…”

“…Later studies of the region uncovered numerous Hα stars (Melikian & Karapetian 2001), optical and near-infrared HH objects and reflection nebulae (Movsessian et al 2003), one of which -the Braid Nebula -was found to be associated with an FU Orionis (FU Ori) type eruptive variable star (Movsessian et al 2006). Some 30 west of RNO 127, Devine et al (1997) found several HH objects, two of which were associated with the bipolar reflection nebula created by HH 381 IRS (IRAS 20568+5217).…”