Common envelope evolution in born-again planetary nebulae - Shaping the H-deficient ejecta of A 30
Journal article, 2022

Born-again planetary nebulae (PNe) are extremely rare cases in the evolution of solar-like stars. It is commonly accepted that their central stars (CSPN) experienced a very late thermal pulse (VLTP), ejecting H-deficient material inside the evolved H-rich PN. Given the short duration of this event and the fast subsequent evolution of the CSPN, details of the mass ejection are unknown. We present the first morphokinematic model of the H-deficient material surrounding a born-again PN, namely A 30. New San Pedro Martir observations with the Manchester Echelle Spectrograph were recently obtained to map the inner region of A 30 which are interpreted by means of the software shape in conjunction with HST WFC3 images. The shape morphokinematic model that best reproduces the observations is composed by a disrupted disc tilted 37 degrees with respect to the line of sight and a pair of orthogonal opposite bipolar ejections. We confirm previous suggestions that the structures closer to the CSPN present the highest expansion velocities, that is, the disrupted disc expands faster than the farther bipolar features. We propose that the current physical structure and abundance discrepancy of the H-deficient clumps around the CSPN of A 30 can be explained by a common envelope phase following the VLTP event. Our proposed scenario is also compared with other known born-again PNe (A 58, A 78, HuBi 1, and the Sakurai's Object).

planetary nebulae: individual: PN A66 30

stars: mass-loss

circumstellar matter

stars: evolution

stars: winds, outflows

Author

J. B. Rodriguez-Gonzalez

Universidad Nacional Autonoma de Mexico

E. Santamaria

University of Guadalajara

J. A. Toala

Spanish National Research Council (CSIC)

Universidad Nacional Autonoma de Mexico

M. A. Guerrero

Spanish National Research Council (CSIC)

B. Montoro-Molina

Spanish National Research Council (CSIC)

G. Rubio

University of Guadalajara

Daniel Tafoya

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Y-H Chu

Academia Sinica

G. Ramos-Larios

University of Guadalajara

L. Sabin

Universidad Nacional Autonoma de Mexico

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 514 4 4794-4802

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1093/mnras/stac1697

More information

Latest update

7/26/2022