Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...353..257b&link_type=abstract
Astronomy and Astrophysics, v.353, p.257-263 (2000)
Astronomy and Astrophysics
Astrophysics
23
Stars: Variables: General, Stars: Agb And Post-Agb, Stars: Circumstellar Matter, Stars: Mass-Loss, Radio Lines: Stars
Scientific paper
We report on high-resolution CO J=1-0 and J=2-1 interferometric observations of the oxygen-rich semiregular variable RV Boo supplemented by single-dish multi-transition data of CO(J=1-0, 2-1, 3-2, 4-3). Detections of the thermal SiO(v=0, J=2-1, 3-2) transitions as well as the vibrationally excited SiO(v=1, J=2-1) line are also reported. The interferometric CO J=2-1 observations, with a spatial resolution of about 1farcs 7, reveal a disk-like structure of size 4farcs 2x 3farcs 3 around RV Boo. Furthermore, the position-velocity information along a line through the center of the source at a position angle of about 150degr can be interpreted as a sign of Keplerian rotation. Six symmetrically placed features, possibly corresponding to three rings, around a central feature are seen. These observations may therefore, to our knowledge, present the first indications of a rotating disk around an AGB star. However, it cannot be fully excluded that the observed kinematical structure is caused by a bipolar outflow. From the single-dish CO observations we estimate the molecular mass of the source to be 3x 10-5 Msun .
Bergman Per
Kerschbaum Florian
Olofsson Hans
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