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Comparisons of SiO maser and long-period variable positions in the R Aquarii and Omicron Ceti binary systems
Hollis, J. M.; Wright, M. C. H.; Welch, W. J.; Jewell, P. R.; Crull, H. E., Jr.; Kafatos, M.; Michalitsianos, A. G.
AA(NASA, Goddard Space Flight Center, Greenbelt, MD), AB(California, University, Berkeley), AC(California, University, Berkeley), AD(National Radio Astronomy Observatory, Tucson, AZ), AE(US Naval Observatory), AF(George Mason University), AG(NASA, Goddard Space Flight Center, Greenbelt, MD)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Oct. 1, 1990, p. 663-666. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Astrometry, Binary Stars, Interstellar Masers, Variable Stars, Silicon Oxides, Very Large Array (Vla), Very Long Base Interferometry
Bibliographic Code:


It has been determined that the absolute position of the centroid of SiO maser-emitting spots toward both R Aqr and Omicron Cet are coincident with the position of the long-period variables (LPVs) in these binary systems to within the errors of measurement. The SiO positions were determined with the Hat Creek interferometer, while the LPV positions were determined with the 8-in transit circle of the US Naval Observatory. These results contradict an earlier report of a circumbinary SiO maser far removed from the LPV in the R Aqr binary system; statistical reasons for the discrepancy are suggested. High-resolution spectra of both sources are presented and possible models are discussed.

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