HD 75747 was known to be variable since 1960 based on observations by A. W. J. Cousins.[18] The system was first observed as an eclipsing binary in 1967 by astronomers P. A. T. Wild and H. C. Lagerweij. J.[19] Andersen deduced a circular orbit with a period of 1.66 days for the system.[7] Subsequent observations revealed that one of the components as a δ Scuti variable.[20] RS Cha is an Algol-type eclipsing binary ranging from 6.02 to 6.58 or 6.68 within 1.6699 days, depending on the eclipse.[2] This system is part of the η Chamaeleontis association, a group of young stars moving with Eta Cha, and Eta Cha is just eight arc-minutes to the northwest of RS Cha.[21]
^Jones, D. H. P. (1969). "Spectroscopic Observations of two Eclipsing Binaries". Monthly Notes of the Astronomical Society of South Africa. 28: 5. Bibcode:1969MNSSA..28....5J. ISSN0024-8266.
^ abJohnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
^ abcdefghijklmAndersen, J. (November 1975). "Spectroscopic observations of eclipsing binaries. I. Description of methods, and results for RS Chamaeleontis and chi 2 Hydrae". Astronomy and Astrophysics. 44: 445–458. Bibcode:1975A&A....44..445A. ISSN0004-6361.
^ abcdClausen, J. V.; Nordstrom, B. (March 1980). "Four-colour photometry of eclipsing binaries. XIa". Astronomy and Astrophysics. 83: 339–347. Bibcode:1980A&A....83..339C. ISSN0004-6361.
^Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
^Cousins, A. W. J. (1960). "New Bright Variable Stars". Monthly Notes of the Astronomical Society of South Africa. 19: 56. Bibcode:1960MNSSA..19...56C. ISSN0024-8266.
^Wild, P. A. T.; Lagerweij, H. C. (1967). "Preliminary Photometric Elements of the Eclipsing Binary System 9 Cha". Monthly Notes of the Astronomical Society of South Africa. 26: 144. Bibcode:1967MNSSA..26..144W. ISSN0024-8266.
^McInally, C. J.; Austin, R. D. (September 1977). "RS Cha: a delta Scuti Variable". Information Bulletin on Variable Stars. 1334: 1. Bibcode:1977IBVS.1334....1M. ISSN0374-0676.