tokens: ACKNOWLEDGEMENTS This study is based on observations made with the SALT under programme 2017-1-MLT-010. BM acknowledges support from the National Research Foundation (NRF) of South Africa and thanks the Institute of Astronomy at KU Leuven for their hospitality. We thank the anonymous referee for a helpful report whose comments helped improve this paper. This paper is based on spectroscopic observations made with the Southern African Large Telescope (SALT) under programme 2017-1-MLT-010 (PI: B. Miszalski). We are grateful to our SALT colleagues for maintaining the telescope facilities and conducting the observations. We thank A.Y. Kniazev for making available his HRS pipeline data products. HVW and RM acknowledge support from the Belgian Science Policy Office under contract BR/143/A2/STARLAB. HVW acknowledges additional support from the Research Council of K.U. Leuven under contract C14/17/082. Polish participation in SALT is funded by grant no. MNiSW DIR/WK/2016/07. This research has been partly founded by the National Science Centre, Poland, through grant OPUS 2017/27/B/ST9/01940 to JM. IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation.
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