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    • Orbital Characteristics of the Subdwarf-B and F V Star Binary EC 20117-4014 (=V4640 Sgr) 

      Otani, Tomomi; Oswalt, T. D.; Lynas-Gray, Anthony Eugene; Kilkenny, David; Koen, Chris; Amaral, Marc; Jordan, Riley (2018-06-01)
      Among the competing evolution theories for subdwarf-B (sdB) stars is the binary evolution scenario. EC 20117-4014 (=V4640 Sgr) is a spectroscopic binary system consisting of a pulsating sdB star and a late F main-sequence ...