ALMA observations of the Red Rectangle, a preliminary analysis

作者：Bujarrabal V^*; Castro Carrizo A; Alcolea J; Van Winckel H; Sanchez Contreras C; Santander Garcia M; Neri R; Lucas R

来源：Astronomy & Astrophysics, 2013, 557: L11.

DOI：10.1051/0004-6361/201322232

• stars: AGB and post-AGB
• circumstellar matter
• radio lines: stars
• planetary nebulae: individual: Red Rectangle

Aims. We aim to study equatorial disks in rotation and axial outflows in post-AGB objects so as to disclose the formation and shaping mechanisms in planetary nebulae. So far, both disks and outflows have not been observed simultaneously.
Methods. We obtained high-quality ALMA observations of (CO)-C-12 and (CO)-C-13 J = 3-2 and (CO)-C-12 J = 6-5 line emission in the Red Rectangle, the only post-AGB/protoplanetary object for which a disk in rotation has been mapped.
Results. These observations provide an unprecedented description of the complex structure of this source. Together with an equatorial disk in rotation, we find a low-velocity outflow that more or less occupies the region situated between the disk and the optical X-shaped nebula. From our observations and preliminary modeling of the data, we confirm the previously known properties of the disk and obtain a first description of the structure, dynamics, and physical conditions of the outflow.

• 出版日期2013-9