ner_tags: O O O O O O O O O O O O B-Event I-Event I-Event O B-Organization B-Person I-Person B-Person I-Person O B-Person I-Person B-Person O B-Person O O O O O O O B-Location B-Organization I-Organization I-Organization O O O O O O O O O O O O O O O O O O O O O O B-Database O B-Database O O O B-Organization O O O O O O O O O O O B-Observatory I-Observatory I-Observatory I-Observatory B-Observatory
tokens: We are grateful to the following people who took part in the infrared photometry programme at Sutherland, Brian Carter, Dave Laney and Enrico Olivier. MWF and PAW gratefully acknowledge a research grant from the SA National Research Foundation. We thank an anonymous referee for comments and specifically for raising the question of the helium abundance. We made use of the VizieR and SIMBAD databases of the CDS in preparing this paper. This paper uses observations made at the South African Astronomical Observatory (SAAO).