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2017•Astronomy and AstrophysicsOpen access

The extended molecular envelope of the asymptotic giant branch star π1 Gruis as seen by ALMA

L. Doan, S. Ramstedt, W. H. T. Vlemmings, S. Höfner, E. De Beck, F. Kerschbaum, M. Lindqvist, M. Maercker, S. Mohamed, C. Paladini, M. Wittkowski

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Abstract

Context. The S-type asymptotic giant branch (AGB) star π1 Gru has a known companion at a separation of 2.̋7 (≈400 AU). Previous observations of the circumstellar envelope (CSE) show strong deviations from spherical symmetry. The envelope structure, including an equatorial torus and a fast bipolar outflow, is rarely seen in the AGB phase and is particularly unexpected in such a wide binary system. Therefore a second, closer companion has been suggested, but the evidence is not conclusive.

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Context. The S-type asymptotic giant branch (AGB) star π1 Gru has a known companion at a separation of 2.̋7 (≈400 AU). Previous observations of the circumstellar envelope (CSE) show strong deviations from spherical symmetry. The envelope structure, including an equatorial torus and a fast bipolar outflow, is rarely seen in the AGB phase and is particularly unexpected in such a wide binary system. Therefore a second, closer companion has been suggested, but the evidence is not conclusive.

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Available abstract

Context. The S-type asymptotic giant branch (AGB) star π1 Gru has a known companion at a separation of 2.̋7 (≈400 AU). Previous observations of the circumstellar envelope (CSE) show strong deviations from spherical symmetry. The envelope structure, including an equatorial torus and a fast bipolar outflow, is rarely seen in the AGB phase and is particularly unexpected in such a wide binary system. Therefore a second, closer companion has been suggested, but the evidence is not conclusive.

Key concepts: Asymptotic giant branch, Physics, Circumstellar envelope, Torus, Astrophysics, Envelope (radar), Context (archaeology), Common envelope

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