Recent High-Resolution Radio Observations of R AQR

Details Recent High-Resolution Radio Observations of R AQR Recent High-Resolution Radio Observations of R AQR

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.0703p&link_type=abstract

American Astronomical Society, 190th AAS Meeting, #07.03; Bulletin of the American Astronomical Society, Vol. 29, p.786

Astronomy and Astrophysics

Astronomy

Scientific paper

We present recent NRAO VLA and VLBA observations of the R Aqr binary system obtained during two observing sessions. In November, 1996 we used the VLA in the A configuration at lambda 7mm. In December, 1995 we observed R Aqr at lambda 6cm using the VLBA in combination with the B configuration VLA. We also reprocessed archival VLA data taken at lambda 6cm in the B configuration in September, 1982. The lambda 7mm observations have for the first time resolved the stellar components of the R Aqr binary system (Hollis, Pedelty, and Lyon 1997, ApJ Letters, in press). We measure an apparent projected separation between the Long Period Variable (LPV) and its hot companion of 55 +/- 2 milli-arcseconds with a position angle of ~ 18(deg) +/- 2(deg) relative to the LPV. We derive an orbital geometry using this initial image along with some reasonable assumptions and obtain a geometrical distance of ~ 200 pc to R Aqr. We also obtained a spectral line image which confirms the ring-like morphology of the LPV SiO maser spots. However, we find that the R Aqr lambda 6cm radio emission is over-resolved by the combined VLBA/VLA. We obtain an upper limit for the ~ milli-arcsecond scale flux density of 0.4 mJy (5 sigma ). Our two sets of VLA B configuration observations at lambda 6cm are separated by 13.2 years. Comparison of the ~ 1" resolution images shows that the R Aqr jet has undergone an apparent counter- clockwise rotation of ~ 6 - 12(deg) on the plane of the sky. These observations, along with previously published proper motion studies, are difficult to reconcile with a garden hose model for the R Aqr jet.

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