Vlbi Astrometric Orbit Solutions Of The Triple Systems Algol And Ux Arietis

Details Vlbi Astrometric Orbit Solutions Of The Triple Systems Algol And Ux Arietis Vlbi Astrometric Orbit Solutions Of The Triple Systems Algol And Ux Arietis

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21710505l&link_type=abstract

American Astronomical Society, AAS Meeting #217, #105.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Multi-epoch phase-referenced VLBI observations are a powerful technique to make sub-milliarcsecond astrometric measurements. We report on high-accuracy orbit and proper motion determination of the well-known active binaries Algol and UX Arietis, combining multi-epoch HSA and VLBA phase-referenced observations with archival VLBI datasets. We find that both Algol and UX Arietis are triple systems, For Algol, we refine the proper motion and outer orbit solutions, confirming the recent optical result of Zavala et al. (2010) that component C's position angle had been reported in error by 180 deg. For UX Arietis, we find a third component orbital solution that accounts for previous VLBI reports of an acceleration term in the proper motion fit.

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