Coordinated Millimeter VLBI Array Observations of R Cassiopeiae: 86 GHz SiO Masers and Envelope Dynamics

Details Coordinated Millimeter VLBI Array Observations of R Cassiopeiae: 86 GHz SiO Masers and Envelope Dynamics Coordinated Millimeter VLBI Array Observations of R Cassiopeiae: 86 GHz SiO Masers and Envelope Dynamics

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....122.2679p&link_type=abstract

The Astronomical Journal, Volume 122, Issue 5, pp. 2679-2685.

Astronomy and Astrophysics

Astronomy

9

Stars: Circumstellar Matter, Radio Emission Lines, Stars: Agb And Post-Agb, Techniques: Interferometric

Scientific paper

Coordinated Millimeter VLBI Array measurements at 86 GHz have imaged the silicon monoxide masers of the nearby red giant R Cassiopeiae at two epochs separated by approximately 1/12 the stellar pulsation period. The v=1, J=2-->1 transition comes from a ring at 1.5 to 2 stellar radii. Doppler velocity patterns are ordered over scales up to ~1 AU but are not consistent with simple models such as global rotation. One major masing region disappeared in the interval between the two epochs.

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