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Missing flux in VLBI observations of SiO maser at 7 mm in IRC+10011

Published online by Cambridge University Press:  16 July 2018

J.-F. Desmurs ,
J. Alcolea ,
V. Bujarrabal ,
F. Colomer  and
R. Soria-Ruiz
J.-F. Desmurs
Affiliation:
Observatorio Astronómico Nacional (OAN/IGN), Spain
J. Alcolea
Affiliation:
Observatorio Astronómico Nacional (OAN/IGN), Spain
V. Bujarrabal
Affiliation:
Observatorio Astronómico Nacional (OAN/IGN), Spain
F. Colomer
Affiliation:
Observatorio Astronómico Nacional (OAN/IGN), Spain JIVE, The Netherlands
R. Soria-Ruiz
Affiliation:
Observatorio Astronómico Nacional (OAN/IGN), Spain
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Abstract

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VLBI observations of SiO masers recover at most 40-50% of the total flux obtained by single dish observations at any spectral channel. Some previous studies seems to indicate that, at least, part of the lost flux is divided up into many weak components rather than in a large resolved emission area. Taking benefit of the high sensitivity and resolution of the HSA, we investigate the problem of the missing flux in VLBI observations of SiO maser emission at 7 mm in the AGB stars and obtain a high dynamic range map of IRC+10011. We conclude that the missing flux is mostly contained in many very weak maser components.

Keywords

stars: AGB and post-AGBinstrumentation: interferometersmasers
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 387 - 388
Copyright
Copyright © International Astronomical Union 2018 

References

Colomer, F., Desmurs, J.-F., Bujarrabal, V. et al. 2017, HSA IX, proc. SEA held on jul 18-22, 2016 in Bilbao, p361-366Google Scholar
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Diamond, P. J., Kemball, A. J., Junor, W., et al., 1994, ApJ, 430, L61CrossRefGoogle Scholar
Soria-Ruiz, R., Alcolea, J., Colomer, F. et al., 2004, A&A, 426, 131Google Scholar