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IFU spectroscopy of southern PN VI: the extraordinary chemo-dynamics of Hen 2-111.
- Source :
- Monthly Notices of the Royal Astronomical Society; Mar2018, Vol. 475 Issue 1, p424-437, 14p
- Publication Year :
- 2018
-
Abstract
- In this paper, we present integral field spectroscopy of the extraordinary Type I bipolar planetary nebula Hen 2-111. In the lobes, we map fast-moving knots of material with [N II] λ6584/H α ratios up to 12, and with radial velocities relative to systemic from -340 up to +390 km s-1. We find evidence of a bipolar ejection event at a velocity ∼600 km s<superscript>-1</superscript> from the central star (assumed to be a binary), which occurred about 8000 yr ago. The fastmoving material is chemically quite distinct from the lower velocity gas in the bipolar lobes, and displays very high N abundances. We show that the fast-moving N-rich knots are not photoionized by the central star, and have constructed detailed shock models for the brightest knot. We find a pre-shock density ∼6 cm<superscript>-3</superscript>, and a shock velocity ∼150 km s<superscript>-1</superscript>. The shock is not fully radiative, being only ∼600 yr old. This shocked gas is partially H-burnt, with helium abundance by mass exceeding that of hydrogen, and is interacting with partially H-burnt material ejected in an earlier episode of mass loss.We conclude that the high-velocity material and the bipolar shell must have originated during the late stages of evolution of a common-envelope phase in a close binary system. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 475
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 128157509
- Full Text :
- https://doi.org/10.1093/mnras/stx3180