Deep amateur-led H-alpha and [O III] imaging reveals five spectroscopically supported new Galactic supernova remnants, two candidates, and extensive new optical structure of the Monogem Ring.
A., Barrera-Ballesteros , J., Rom \'a n-Z \'u \ n iga , C
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The Helix Nebula is a low-density, stratified object with near-solar oxygen abundance (8.7), a ~1 dex sulfur deficit, and moderate helium/nitrogen enrichment placing it near the Type I boundary, with abundance variations attributed to ionization structure rather than chemical inhomogeneity.
The Galactic Center Lobe is a foreground HII region at ~2 kpc, photoionized and forming a closed outer loop, not a Galactic center feature.
citing papers explorer
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Optical Discovery of New and Candidate Galactic Supernova Remnants Plus Optical Imaging of the Monogem Supernova Remnant
Deep amateur-led H-alpha and [O III] imaging reveals five spectroscopically supported new Galactic supernova remnants, two candidates, and extensive new optical structure of the Monogem Ring.
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SDSS-V LVM: Revealing the Physical and Chemical Structure of the Helix Nebula
The Helix Nebula is a low-density, stratified object with near-solar oxygen abundance (8.7), a ~1 dex sulfur deficit, and moderate helium/nitrogen enrichment placing it near the Type I boundary, with abundance variations attributed to ionization structure rather than chemical inhomogeneity.
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SDSS-V LVM: Verifying what, and where, the 'Galactic Center' Lobe is
The Galactic Center Lobe is a foreground HII region at ~2 kpc, photoionized and forming a closed outer loop, not a Galactic center feature.