volume 13, issue S336, P387-388 2017
DOI: 10.1017/s1743921317009553
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J.-F. Desmurs, J. Alcolea, V. Bujarrabal, F. Colomer, R. Soria-Ruiz

Abstract: 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 m…

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