Near-IR imaging and spectroscopy of GGD27 - IRS

Details Near-IR imaging and spectroscopy of GGD27 - IRS Near-IR imaging and spectroscopy of GGD27 - IRS

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..299a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 299-314.

Astronomy and Astrophysics

Astronomy

28

Infrared Imagery, Infrared Sources (Astronomy), Infrared Spectroscopy, Interstellar Extinction, Nebulae, Pre-Main Sequence Stars, Astronomical Photometry, Astronomical Polarimetry, Astronomical Spectroscopy, Near Infrared Radiation, Seeing (Astronomy)

Scientific paper

Seeing limited near-IR imaging photometry and polarimetry of the IR reflection nebula GGD27 - IRS are presented in order to investigate the source's peculiar morphology and detail its photometric and polarimetric properties. IRS2, previously thought to be the source of illumination of the nebula, is shown to be a bright knot of emission at the apex of the northern lobe of the bipolar-shaped nebula. It is inferred from the observed polarimetric pattern and from evidence from narrow-band imaging and 3-micron spectroscopy that the source of illumination of much of the nebula, and therefore the source of the associated bipolar molecular outflow, is an unseen stellar object situated approximately 3 arcsec SW of IRS2. Estimates of the optical depth and visual extinction in the region are also presented. It is proposed that the nebula/outflow is aligned close to the plane of the sky and both a large-scale 'interstellar' disk and small-scale 'circumstellar' disk or envelope obscure the central illuminating source from direct view.

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