Radio continuum monitoring of the extreme carbon star IRC+10216

Abstract

We describe Very Large Array observations of the extreme carbon star IRC+10216 at 8.4, 14.9, and 22.5 GHz made over a two year period. We find possible variability correlated with the infrared phase and a cm- to sub-millimeter wavelength spectral index very close to 2. The variability, observed flux densities, and upper limit on the size are consistent with the emission arising from the stellar photosphere or a slightly larger radio photosphere.

arXiv comment9 pages, incl. 4 figures. To appear in Astronomy & Astrophysics

References in corpus (3)

• The Submillimeter Array
• Smoke Signals From IRC +10216: 1. Milliarcsecond Proper Motions of the Dust
• Submillimeter Array Observations of CS J=14--13 Emission from the Evolved Star IRC+10216

Cited by in corpus (20)

• ALMA data suggest the presence of a spiral structure in the inner wind of CW Leo
• An Interferometric Spectral-line Survey of IRC+10216 in the 345 GHz Band
• The size, luminosity and motion of the extreme carbon star IRC+10216 (CW Leonis)
• IRC +10 216 in 3-D: morphology of a TP-AGB star envelope
• Herschel PACS and SPIRE imaging of CW Leo
• Submillimeter narrow emission lines from the inner envelope of IRC+10216
• Molecular shells in IRC+10216: Evidence for non-isotropic and episodic mass loss enhancement
• The complex dust formation zone of the AGB star IRC+10216 probed with CARMA 0.25 arcsec angular resolution molecular observations
• 870 um observations of evolved stars with LABOCA
• HST Images Reveal Dramatic Changes in the Core of IRC+10216
• The Evolving Radio Photospheres of Long-Period Variable Stars
• Widespread HCN maser emission in carbon-rich evolved stars
• SiS in the circumstellar envelope of IRC +10126: maser and quasi-thermal emission
• Modeling rotational disruption of grains and microwave emission from spinning dust in AGB envelopes
• Detection of Vibrationally Excited CO in IRC+10216
• Gas infall and possible circumstellar rotation in R Leo
• Vibrationally excited HCN transitions in circumstellar envelopes of carbon-rich AGB stars
• The Sub-mm Variability of IRC+10216 and $o$ Ceti
• Studies of Evolved Stars in the Next Decade: EAO Submillimetre Futures White Paper Series, 2019
• The Nearby Evolved Stars Survey II: Constructing a volume-limited sample and first results from the James Clerk Maxwell Telescope