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ALMA view of the circumstellar environment of the post-common-envelope-evolution binary system HD 101584

Hans Olofsson (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Matthias Maercker (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; E. M. L. Humphreys ; Michael Lindqvist (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; L. Nyman ; S. Ramstedt
Astronomy and Astrophysics (0004-6361). Vol. 576 (2015),
[Artikel, refereegranskad vetenskaplig]

Aims. We study the circumstellar evolution of the binary HD 101584, consisting of a post-AGB star and a low-mass companion, which is most likely a post-common-envelope-evolution system. Methods. We used ALMA observations of the (CO)-C-12, (CO)-C-13, and (CO)-O-18 J = 2-1 lines and the 1.3 mm continuum to determine the morphology, kinematics, masses, and energetics of the circumstellar environment. Results. The circumstellar medium has a bipolar hour-glass structure, seen almost pole-on, formed by an energetic jet, approximate to 150 km s(-1). We conjecture that the circumstellar morphology is related to an event that took place approximate to 500 yr ago, possibly a capture event where the companion spiraled in towards the AGB star. However, the kinetic energy of the accelerated gas exceeds the released orbital energy, and, taking into account the expected energy transfer efficiency of the process, the observed phenomenon does not match current common-envelope scenarios. This suggests that another process must augment, or even dominate, the ejection process. A significant amount of material resides in an unresolved region, presumably in the equatorial plane of the binary system.

Nyckelord: circumstellar matter, stars: individual: HD 101584, stars: mass-loss, stars: AGB and post-AGB, radio lines: stars

Denna post skapades 2015-08-07. Senast ändrad 2016-02-04.
CPL Pubid: 220364


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Denna publikation är ett resultat av följande projekt:

Magnetic fields and the outflows during the formation and evolution of stars (OUTFLOWMAGN) (EC/FP7/614264)