Detection of CH⁺, CH and H₂ Molecules in the Young Planetary Nebula IC 4997

Detection of CH⁺, CH and H₂ Molecules in the Young Planetary Nebula IC 4997

We have detected CH⁺ and CH molecular absorption lines from the youngcompact planetary nebula IC 4997 from high resolution optical spectra. A high-resolution infra-red (H and K bands) spectrum provides detection of H₂ emission lines among many other lines. The H₂ lines provide an excitation temperat...

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Veröffentlicht in:Publications of the Astronomical Society of the Pacific 2020-07, Vol.132 (1013), p.1-13
Hauptverfasser: Rao, N. Kameswara, Lambert, David L., Reddy, Arumalla B. S., García-Hernández, D. A., Manchado, Arturo, Díaz-Luis, J. J.
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Emission lines
Stars and Stellar Evolution
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container_issue 1013
container_start_page 1
container_title Publications of the Astronomical Society of the Pacific
container_volume 132
creator Rao, N. Kameswara
Lambert, David L.
Reddy, Arumalla B. S.
García-Hernández, D. A.
Manchado, Arturo
Díaz-Luis, J. J.
description We have detected CH⁺ and CH molecular absorption lines from the youngcompact planetary nebula IC 4997 from high resolution optical spectra. A high-resolution infra-red (H and K bands) spectrum provides detection of H₂ emission lines among many other lines. The H₂ lines provide an excitation temperature of 2100 K which may result from UV fluorescence in the envelope or from shocks formed at the interface between an expanding outflow of ionized gas and the neutral envelope ejected when the star was on the AGB. It is suggested that the CH⁺ may result from the endothermic reaction C + H₂ → CH⁺ + H. Intriguingly, CH⁺ and also CH show a higher expansion velocity than H₂ emission suggesting they may be part of the post-shocked gas.
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Stars and Stellar Evolution
title Detection of CH⁺, CH and H₂ Molecules in the Young Planetary Nebula IC 4997
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