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HD 169981 - an overlooked photometric binary?
Lehmann, H.; Scholz, G.; Hildebrandt, G. +1 more
In 1999 and 2000 we obtained spectroscopic and photometric observations of the A-type binary star HD 169981. The observations were part of a campaign to search for short-term photometric and radial-velocity variations among early-type binaries. From the radial velocities of 18 metal lines we derived more precise orbital elements. Quite unexpectedl…
The comparative accuracy of photographic observations of radio stars observed at the Engelhardt Astronomical Observatory
Rizvanov, N.; Dautov, I.; Shaimukhametov, R.
At the Engelhardt Astronomical Observatory (EAO), we observed photographic positions of 113 Galactic Radio Sources (GRS) in the system PPM catalogue (Rizvanov & Dautov 1998). Analysis of their accuracy is made by comparison with the Hipparcos catalogue (Perryman et al. 1997) and astrometric catalogue of radio stars in the radio window from the…