C. Aspin et al., THERMAL INFRARED IMAGING OF GGD27-IRS - THE ACTIVE PRE-MAIN-SEQUENCE STAR REVEALED, Astronomy and astrophysics, 292(2), 1994, pp. 120000009-120000012
We present near-IR (NIR) 2.2-4.7 mu m imaging of the core region of th
e pre-main sequence bipolar CO outflow source GGD27-IRS. Indirect evid
ence from earlier imaging polarimetry and long-slit spectroscopy sugge
sted that the true young active star in the region, GGD27-ILL, is heav
ily embedded and completely obscured even at 2 mu m. Our new 4.7 mu m
images directly detect this source for the first time locating it at 2
.0'' west, 1.3'' south of the bright NIR source IRS2. This position is
0.2'' from the position derived from our earlier NIR polarization map
s. New mid-IR images of the core region show three pointlike sources w
hich are identified as GGD27-ILL, IRS7 and IRS8. We discuss the morpho
logical composition of the core region in light of our discovery.