Indian astronomers have performed X-ray observations of an X-ray binary designated 4U 1907+09. Results of the observational ...

ABSTRACT We present radial velocity measurements and a single‐lined spectroscopic orbit for the bright O‐type star, HD 193322A, which we show to be a 311 day binary system that has a distant third ...

ABSTRACT An attempt has been made to spatially resolve the metal‐poor, double‐lined spectroscopic binary HD 20039 with the Hubble Space Telescope Fine Guidance System. Astrometric measurements of the ...