2020/09/28 by J. S. Rechy-García, M. A. Guerrero, E. Santamaría +8
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Ejecta #Field (mathematics) #Nebula #Planetary nebula #Shell (structure) #Spectral resolution #Spectroscopy #Stellar, planetary, and galactic studies #astro-ph.GA #astro-ph.SR
paper · pdf · doi:10.3847/2041-8213/abbe22
7 pages, 5 Figures; accepted to ApJL
arxiv created 2020/09/28 · openalex created_date 2020/10/08 · openalex publication_date 2020/10/23 · arxiv updated 2020/11/11 · openalex updated_date 2026/08/05
Abstract HuBi 1 has been proposed to be member of the rare class of born-again planetary nebulae (PNe), i.e., its central star experienced a very late thermal pulse and ejected highly processed material at high speeds inside the old hydrogen-rich PN. In this Letter we present GTC MEGARA integral field spectroscopic observations of the innermost regions of HuBi 1 at high spectral resolution ≃16 km s −1 and multi-epoch subarcsecond images obtained ≃12 yr apart. The analysis of these data indicates that the inner regions of HuBi 1 were ejected ≃200 yr ago and expand at velocities ≃300 km s −1 , in excellent agreement with the born-again scenario. The unprecedented tomographic capabilities of the GTC MEGARA high-dispersion observations used here reveal that the ejecta in HuBi 1 has a shell-like structure, in contrast to the disrupted disk and jet morphology of the ejecta in other born-again PNe.