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-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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- October 2019
- DOI:
- arXiv:
- arXiv:1908.02500
- Bibcode:
- 2019MNRAS.489.1481J
- Keywords:
-
- stars: abundances;
- stars: chemically peculiar;
- stars: fundamental parameters;
- stars: individual (EC 22536-5304);
- subdwarfs;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 8 pages, 3 figures, MNRAS in press