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Photometric and spectral observations of two W UMa stars with periods of one third of a day

Kjurkchieva, D. P.; Marchev, D. V.; Popov, V. A.

Speckle observations with PISCO in Merate (Italy): XVI. Astrometric measurements of visual binaries in 2015, and new orbits for DUN 5, ADS 5958, 6276, 7294, 8211, and 13169

Scardia, M.; Prieur, J. -L.; Pansecchi, L. +3 more

We present relative astrometric measurements of visual binaries, made in 2015, with the speckle camera PISCO of the 102-cm Zeiss telescope of Brera Astronomical Observatory, Merate, Italy. Our observing list contains orbital couples as well as binaries whose motion is still uncertain. We obtained 196 new measurements of 173 visual binary stars, wi…

The first Charge Coupled Device photometry of the poorly studied clusters Teutsch 126 & Czernik 11

Hendy, Yasser; Tadross, Ashraf Latif; Bendary, Reda +1 more

In this study, we determined the astrophysical parameters of the poorly studied clusters Teutsch 126 and Czernik 11. We used the Visual Red Charge Coupled Device pass-bands that were carried down to a limiting magnitude of V = 20 mag. The stars of the clusters were observed utilizing the Newtonian focus of a 74-inch telescope at the Kottamia Astro…

A photometric study of the nonrelaxed cluster Mayer 3

Tadross, A. L.; Bendary, R.; Hasan, P.

The astrophysical parameters of the open star cluster Mayer 3 have been estimated using the Newtonian focus (f/4.84) of the 1.88 m Telescope of Kottamia Observatory in Egypt. The VRI observations have been carried out down to a limiting magnitude of V ~ 20 mag. To emphasize the main astrophysical parameters, Near-Infra Red, Two Micron All Sky Surv…

An analysis of four stellar rings

Leschinski, Kieran; Paunzen, Ernst; Gütl-Wallner, Anna +9 more