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| Paper: |
The Multi-Scale Environment of RS Cnc from CO and H I Observations |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
119 |
| Authors: |
Hoai, D. T.; Matthews, L. D.; Winters, J. M.; Nhung, P. T.; Gérard, E.; Libert, Y.; Le Bertre, T. |
| Abstract: |
We present a detailed study of the circumstellar gas distribution and
kinematics of the semi-regular variable star RS Cnc on spatial scales
ranging from ∼1″ (∼150 AU) to ∼6′
(∼0.24 pc). The close environment of RS Cnc (from 1 to 20″)
can be described with a model in which the density and velocity vary
smoothly from the equatorial plane to the polar axis. In this model
the mass loss rate is higher along the polar directions than in the
equatorial plane, which does not favor current models invoking stellar
rotation or a magnetic field as the cause of the axi-symmetry. Outside
this region, the study of which is limited by the photo-dissociation
of CO, H I data at 21 cm show that the flow is slowed down at a typical
distance of 1′ (∼0.04 pc). Further away (1 to 6′,
or 0.04 to 0.24 pc), the flow is distorted by the relative motion of
the star with respect to the interstellar medium. |
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