Issue |
A&A
Volume 453, Number 1, July I 2006
|
|
---|---|---|
Page(s) | 301 - 307 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20054463 | |
Published online | 09 June 2006 |
Radio continuum monitoring of the extreme carbon star IRC+10216
1
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: kmenten,p309ekr@mpifr-bonn.mpg.de
2
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA e-mail: reid@cfa.harvard.edu
3
National Radio Astronomy Obsrvatory, Array Operations Center, PO Box O, Socorro, NM 87801, USA e-mail: mclausse@nrao.edu
4
Jet Propulsion Laboratory, MS 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109, USA e-mail: raghvendra.sahai@jpl.nasa.gov
Received:
2
November
2005
Accepted:
15
March
2006
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.
Key words: stars: carbon / stars: AGB and post-AGB / radio continuum: stars / techniques: interferometic
© ESO, 2006
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