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Editor's note: A high-energy view of exoplanets and their environments

Schartel, Norbert

The harsh environment where exoplanets live

Pillitteri, Ignazio

Rectilinear elements of visual optical double stars: With application to the 1829 southern double star catalogue of James Dunlop

Letchford, Roderick R.; White, Graeme L.; Brown, Carolyn J.

The relative Rectilinear motion of optical double stars provides an important clue to the relationship of the components. We provide an objective method of confirming the optical status of double stars, and of obtaining unbiased rectilinear elements solely on data obtained from the HIPPARCOS and Gaia DR2 space missions. We apply this technique to …

Quasars' physical properties study based on the medium-band photometric survey

Kotov, Sergey; Dodonov, Sergey; Grokhovskaya, Aleksandra

The study is about the quasars' cosmological evolution. We used the medium-band photometric survey at the 1-m Schmidt telescope of the Byurakan Astrophysical Observatory. The HS47-22 field with an area of 2.38 square degrees has been selected. We have classified objects and composed a sample of quasars using broadband photometric data and morpholo…

WX Cen is X‑ray quiet: Does this signify a high‑mass or a low‑mass binary?

Zhekov, Svetozar A.

We present results from analysis of the XMM–Newton observation (2021 February) of the enigmatic object WX Cen: a presumed massive Wolf–Rayet (WR) binary, (WN3 + WC4), or a low‑mass binary. WX Cen was not detected in X‑rays. Its UV emission shows periodic variability with a period (0.405–0.434 day) similar to that found in the optical for this obje…