The Discovery of Herbig-Haro Objects in LDN 673

TL;DR

This paper reports the discovery of twelve new Herbig-Haro objects in LDN 673 using a novel imaging method, confirming their nature with follow-up observations, and identifying potential driving sources, thereby providing new insights into star formation in the Aquila clouds.

Contribution

The paper introduces a novel color-composite imaging technique for detecting faint HH objects and links them to specific young stellar objects in LDN 673, expanding understanding of star formation in this region.

Findings

Twelve new HH objects discovered in LDN 673.

Confirmed HH objects with follow-up [S II] observations.

Identified potential driving sources associated with star-forming regions.

Abstract

We report the discovery of twelve faint Herbig-Haro (HH) objects in LDN 673 found using a novel color-composite imaging method that reveals faint H{\alpha} emission in complex environments. Follow-up observations in [S II] confirmed their classification as HH objects. Potential driving sources are identified from the Spitzer c2d Legacy Program catalog and other infrared observations. The twelve new HH objects can be divided into three groups: Four are likely associated with a cluster of eight YSO class I/II IR sources that lie between them; five are colinear with the T Tauri multiple star system AS 353, and are likely driven by the same source as HH 32 and HH 332; three are bisected by a very red source that coincides with an infrared dark cloud. We also provide updated coordinates for the three components of HH 332. Inaccurate numbers were given for this object in the discovery paper. The discovery of HH objects and associated driving sources in this region provides new evidence for star formation in the Aquila clouds, implying a much larger T Tauri population in a seldom-studied region.