Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...645..605c&link_type=abstract
The Astrophysical Journal, Volume 645, Issue 1, pp. 605-612.
Astronomy and Astrophysics
Astronomy
14
Stars: Circumstellar Matter, Stars: Agb And Post-Agb, Stars: Individual (Π Gruis)
Scientific paper
We study the molecular outflow of the nearby evolved S star π1 Gru. We imaged the outflow in CO J=2-1 and dust continuum with the Submillimeter Array. The CO emission was detected over a very broad velocity width of ~90 km s-1. Our high-resolution images show that the outflow at low velocities (<=15 km s-1) is elongated east-west and at high velocities (>=25 km s-1) is displaced north (at redshifted velocities) and south (blueshifted velocities) of center as defined by the dust continuum source. We model the spatial-kinematic structure of the low-velocity outflow as a flared disk with a central cavity of radius 200 AU and an expansion velocity of 11 km s-1, inclined by 55° to our line of sight. We attribute the high-velocity component to a bipolar outflow that emerges perpendicular to this disk with a velocity of up to ~45 km s-1. This high-velocity outflow may play an important role in shaping the gas envelope previously ejected by the AGB star and thus produce a bipolar morphology when the object evolves into a proto-planetary nebula.
Chiu Po-Jian
Dinh-V-Trung
Hirano Naomi
Hoang Chi-Thiem
Kwok Sun
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