EC 22536-5304: SALT identifies a new lead-rich intermediate helium subdwarf

Abstract SALT spectra of the helium-rich hot subdwarf EC 22536-5304 show strong absorption lines of triply-ionized lead. Analysis of the HRS spectrum and a follow-up SALT/RSS spectrum show EC 22536-5304 to have surface properties (temperature, gravity, helium/hydrogen ratio) similar to other heavy-m...

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Bibliographic Details
Published inMonthly notices of the Royal Astronomical Society
Main Authors Jeffery, C S, Miszalski, B
Format Journal Article
LanguageEnglish
Published 01.10.2019
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Summary:Abstract SALT spectra of the helium-rich hot subdwarf EC 22536-5304 show strong absorption lines of triply-ionized lead. Analysis of the HRS spectrum and a follow-up SALT/RSS spectrum show EC 22536-5304 to have surface properties (temperature, gravity, helium/hydrogen ratio) similar to other heavy-metal subdwarfs. With a lead overabundance of 4.8 dex relative to solar, EC 22536-5304 is the most lead-rich intermediate helium subdwarf discovered so far.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stz2231