Mid-IR Spectral Features of Young Stars in the BD+40 4124 Region

Astronomy and Astrophysics – Astronomy

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Scientific paper

We will present mid-IR images acquired with MIRAC (Mid-Infrared Array Camera) of four young stellar objects in the BD+40 4124 region of the Cygnus molecular cloud. Only BD+40 4124 had been previously identified as an emitter of the Unidentified InfraRed (UIR) emission features. Our mid-infrared images at 8.8, 10.3, 11.7, 12.5, and 17.2mu resolve the two components of LkHa 225 and show that the southern component is the strongest UIR emitter in the region. This finding is confirmed by near-IR images of the region which we obtained with IRCAM at UKIRT. The near-IR images show that the northern source in LkHa 225 is much brighter at continuum wavelengths, while the southern source brightens considerably in the 3.3mu UIR feature. The near-IR data also suggests the presence of connecting material between the two components of LkHa 225, raising the question of how two related objects can have significantly different circumstellar environments. A discussion the implications of our results will also be presented.

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