Abundance Analysis of the J4 Equatorial Knot of the Born-again Planetary Nebula A30

Bibcode
2022RNAAS...6....4S
DOI
10.3847/2515-5172/ac47a6
Simpson, Jordan; Jones, David; Wesson, Roger; García-Rojas, Jorge
Bibliographical reference

Research Notes of the American Astronomical Society

Advertised on:
1
2022
Number of authors
4
IAC number of authors
2
Citations
4
Refereed citations
2
Description
A30 belongs to a class of planetary nebulae identified as "born-again", containing dense, hydrogen-poor ejecta with extreme abundance discrepancy factors (ADFs), likely associated with a central binary system. We present intermediate-dispersion spectroscopy of one such feature-the J4 equatorial knot. We confirm the apparent physical and chemical segregation of the polar and equatorial knots observed in previous studies, and place an upper limit on the ADF for O2+ of 35, significantly lower than that of the polar knots. These findings further reinforce the theory that the equatorial and polar knots originate from different events.
Type
Non-refereed

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