A strong He II $λ$1640 emitter with extremely blue UV spectral slope at $z=8.16$: presence of Pop III stars? · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/2212.04476/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTA strong He II $λ$1640 emitter with extremely blue UV spectral slope at $z=8.16$: presence of Pop III stars? — mentioned by perihelionshttps://news.ycombinator.com/item?id=34584289urn:hackerpapers:mention:2212.04476:34584289Mon, 30 Jan 2023 18:34:37 GMT<p>Am I blind or does the paper not mention helium-2 at all? https://arxiv.org/abs/2212.04476 It talks extensively about &quot;He II&quot;, the astrophysics notation for singly-ionized helium (a helium atom with one electron removed; He+). That isn&#x27;t notation for a helium isotope. I can&#x27;t see anything in the paper mentioning isotopes, nuclear reactions, or anything in that direction. (?)</p><p><a href="https://hackerpaper.kaipfister.de/p/2212.04476/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.GA