Coordinated Millimeter VLBI Array Observations of R Cassiopeiae: 86 GH[CLC]z[/CLC] S[CLC]i[/CLC]O Masers and Envelope Dynamics
2001; Institute of Physics; Volume: 122; Issue: 5 Linguagem: Inglês
10.1086/323449
ISSN1538-3881
AutoresR. B. Phillips, G. R. Sivakoff, C. J. Lonsdale, Sheperd S. Doeleman,
Tópico(s)Astronomical Observations and Instrumentation
ResumoCoordinated 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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