Multi-wavelength diffraction-limited imaging of the evolved carbon star IRC +10216, II

Abstract

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).

Accepted ApJ, Jan 2005

References in corpus (8)

• User Manual for DUSTY
• Michelson Interferometry with the Keck I Telescope
• Smoke Signals From IRC +10216: 1. Milliarcsecond Proper Motions of the Dust
• Temporal Variations of Mid-IR Spectra in Late-Type Stars
• Mid-infrared interferometry on spectral lines: II. Continuum (dust) emission around IRC+10216 and VY CMa
• Bispectrum speckle interferometry of IRC+10216: the dynamic evolution of the innermost circumstellar environment from 1995 to 2001
• Near and mid-IR sub-arcsecond structure of the dusty symbiotic star R Aqr
• IRC+10216 in Action: Present Episode of Intense Mass-Loss Reconstructed by Two-Dimensional Radiative Transfer Modeling

Cited by in corpus (15)

• A Detailed Analysis of the Dust Formation Zone of IRC+10216 Derived from Mid-IR Bands of C2H2 and HCN
• 2D Models for Dust-driven AGB Star Winds
• The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales
• Unveiling the dust nucleation zone of IRC+10216 with ALMA
• The size, luminosity and motion of the extreme carbon star IRC+10216 (CW Leonis)
• The complex dust formation zone of the AGB star IRC+10216 probed with CARMA 0.25 arcsec angular resolution molecular observations
• The PTI Carbon Star Angular Size Survey: Effective Temperatures and Non-Sphericity
• The weather report from IRC+10216: Evolving irregular clouds envelop carbon star
• Mapping the Linearly Polarized Spectral Line Emission around the Evolved Star IRC+10216
• Radiation-driven acceleration in the expanding WR140 dust shell
• Surprising detection of an equatorial dust lane on the AGB star IRC+10216
• Monitor variability of millimeter lines in IRC +10216
• A Review of AGB Mass Loss Imaging Techniques
• The unlikely rise of masking interferometry: leading the way with 19th century technology
• High Angular Resolution Stellar Imaging with Occultations from the Cassini Spacecraft II: Kronocyclic Tomography