SIMBAD references

2016MNRAS.460L..35G - Mon. Not. R. Astron. Soc., 460, L35-L39 (2016/July-3)

First detection of 3He+ in the planetary nebula IC 418.

GUZMAN-RAMIREZ L., RIZZO J.R., ZIJLSTRA A.A., GARCIA-MIRO C., MORISSET C. and GRAY M.D.

Abstract (from CDS):

The ^3He isotope is important to many fields of astrophysics, including stellar evolution, chemical evolution, and cosmology. The isotope is produced in low-mass stars which evolve through the planetary nebula (PN) phase. ^3He abundances in PNe can help test models of the chemical evolution of the Galaxy. We present the detection of the 3He+ emission line using the single dish Deep Space Station 63, towards the PN IC 418. We derived a ^3He/H abundance in the range 1.74±0.8 x 10^-3 to 5.8±1.7 x 10^-3, depending on whether part of the line arises in an outer ionized halo. The lower value for ^3He/H ratio approaches values predicted by stellar models which include thermohaline mixing, but requires that large amounts of ^3He are produced inside low-mass stars which enrich the interstellar medium (ISM). However, this overpredicts the ^3He abundance in H ii regions, the ISM, and protosolar grains, which is known to be of the order of 10^-5. This discrepancy questions our understanding of the evolution of the ^3He, from circumstellar environments to the ISM.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - circumstellar matter - planetary nebulae: individual: IC 418 - radio lines: stars - radio lines: stars

Status at CDS:  

Simbad objects: 9

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2020.05.26-23:40:16

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