Kind of entertaining, in hindsight, to the read the reasoning of the Compton & Russell paper [0] cited in Payne-Gaposchkin's thesis [1] as the explanation of th

Kind of entertaining, in hindsight, to the read the reasoning of the Compton & Russell paper [0] cited in Payne-Gaposchkin's thesis [1] as the explanation of the "spurious" hydrogen abundance: - "This would demand an absurdly great abundance of hydrogen relative to magnesium (itself an abundant element)[...] It appears necessary, therefore, that the effective value of q_2 for the two-quantum state of hydrogen is increased in some special way, by a very large factor..." [0] https://sci-hub.se/10.1038/114086a0 https://sci-hub.se/10.1038/114086a0 ("A Possible Explanation of the Behaviour of the Hydrogen Lines in Giant Stars (1924)") [1] https://articles.adsabs.harvard.edu//full/1925PhDT.........1P/0000056.000.html https://articles.adsabs.harvard.edu//full/1925PhDT.........1...