Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..219a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 219-224.
Astronomy and Astrophysics
Astrophysics
24
Infrared Spectroscopy, Pre-Main Sequence Stars, Reflection Nebulae, Star Clusters, Absorption Spectra, Color-Color Diagram, Emission Spectra
Scientific paper
We present mid-IR spectroscopy of 5 objects in the bipolar outflow source and near-IR reflection nebula GGD27-IRS. The sources IRS1, IRS3 and Objects a and b are all bright at 10 microns and possess strong emission features at 8.6 microns, 11.3 microns and 12.6 microns typical of the unidentified (UIR) emission bands seen in many nebulae. IRS2 is also bright at 10 microns and possesses a silicate absorption band and weak UIR bands, the latter probably the result of contamination from the nearby sources Objects a and b. The presence of UIR bands at four distinct locations in GGD27-IRS implies each location is being irradiated by UV flux and suggests there are several intermediate- to high-mass young stellar objects in this region. The bright nature of these spatially well-separated sources in the mid-IR supports this hypothesis and suggests that there must exist local sources of heating in each region. We discuss both the observed spectral features and the near- to mid-IR colors of the sources and demonstrate the value of mid-IR photometry in separating circumstellar emission from interstellar and molecular cloud reddening. We conclude that GGD27-IRS is in fact, a young premain sequence cluster with at least three, and probably more, members.
Aspin Colin
Geballe Thomas Ronald
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