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Space-Based Photometry of Binary Stars: From Voyager to TESS

Southworth, John

Binary stars are crucial laboratories for stellar physics, so have been photometric targets for space missions beginning with the very first orbiting telescope (OAO-2) launched in 1968. This review traces the binary stars observed and the scientific results obtained from the early days of ultraviolet missions (OAO-2, Voyager, ANS, IUE), through a …

Modified Newtonian Gravity, Wide Binaries and the Tully-Fisher Relation

Acedo, Luis

A recent study of a sample of wide binary star systems from the Hipparcos and Gaia catalogues has found clear evidence of a gravitational anomaly of the same kind as that appearing in galaxies and galactic clusters. Instead of a relative orbital velocity decaying as the square root of the separation, ΔV∝r‑1/2, it was shown that an asymptotic const…