Physics – Optics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341402v&link_type=abstract
American Astronomical Society, AAS Meeting #213, #414.02; Bulletin of the American Astronomical Society, Vol. 41, p.224
Physics
Optics
Scientific paper
MWC 778 is an unusual and little-studied young stellar object, previously classified as a Herbig Ae/Be star, located in the reflection nebula IC 2144. We present a study of this object based on optical imaging, high resolution (R=48000) optical spectroscopy, moderate resolution (R=2000) near-infrared spectroscopy, near-infrared adaptive optics imaging polarimetry, and mid-infrared imaging. The optical and near-infrared spectra of MWC 778 are dominated by an extensive forest of strong emission lines, primarily from H and Fe. However, the optical spectrum also reveals the presence of weak absorption features normally associated with F or G spectral types. The bolometric luminosity is found to be ≥ 510 L&sun;, surprisingly large for such a late spectral type. Differences between the spectrum of the object and the nebula in which it is embedded suggest the presence of a circumstellar disk inclined to the line of sight, a suggestion which our adaptive optics polarimetry and mid-infrared imaging observations directly and spectacularly confirm. These observations resolve the object into a large (1200 AU, for an assumed distance of 1 kpc) nearly edge-on disk and two limb-brightened conical outflow cavities. The imaging observations also reveal the presence of a large (12 arcsec diameter) spiral structure surrounding MWC 778. We discuss the properties of this object as revealed by our observations and speculate on its nature and evolutionary status.
Graham James R.
Herbig George H.
Perrin Marshall D.
Vacca William D.
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