Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-03-09
Astrophys.J. 624 (2005) 352-358
Astronomy and Astrophysics
Astrophysics
Accepted ApJ, Jan 2005
Scientific paper
10.1086/428932
High angular resolution images of IRC +10216 taken at various bandpasses within the near-infrared h, k & l bands are presented. The maps have the highest angular resolution yet recovered, and were reconstructed from interferometric measurements obtained at the Keck 1 telescope in 1997 December and 1998 April, forming a subset of a 7-epoch monitoring program presented earlier [paper 1]. Systematic changes with observing wavelength are found and discussed in context of present geometrical models for the circumstellar envelope. With these new high-resolution, multi-wavelength data and contemporaneous photometry, we also re-visit the hypothesis that the bright compact Core of the nebula (component `A') marks the location of the central carbon star. We find that directly measured properties of the Core (angular size, flux density, color temperature) are consistent with a reddened carbon star photosphere (line-of-sight tau=5.3).
Danchi William C.
Monnier John D.
Tuthill Peter G.
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