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Stellar activity analysis of Barnard's Star: Very slow rotation and evidence for long-term activity cycle
B. Toledo-Padrón, J. I. González Hernández, C. Rodríguez-López +58
The search for Earth-like planets around late-type stars using ultra-stable spectrographs requires a very precise characterization of the stellar activity and the magnetic cycle of…
Fast radio bursts: the observational case for a Galactic origin
Dan Maoz, Abraham Loeb, Yossi Shvartzvald +10
There are by now ten published detections of fast radio bursts (FRBs), single bright GHz-band millisecond pulses of unknown origin. Proposed explanations cover a broad range from e…
Model computations of blue stragglers and W UMa-type stars in globular clusters
Kazimierz Stepien, Marcin Kiraga
It was recently demonstrated that contact binaries occur in globular clusters (GCs) only immediately below turn-off point and in the region of blue straggler stars (BSs). In additi…
Evolution of Cool Close Binaries -- Rapid Mass Transfer and Near Contact Binaries
Kazimierz Stepien, Marcin Kiraga
[Abridged] We test the evolutionary model of cool close binaries on the observed properties of near contact binaries (NCBs). Those with a more massive component filling the Roche l…
ASAS Photometry of ROSAT Sources. II.New Variables from the ASAS North Survey
M. Kiraga, K. Stepien
We present a catalog of 307 optical counterparts of the bright ROSAT X-ray sources, identified with the ASAS North survey data and showing periodic brightness variations. They all…
ASAS photometry of ROSAT sources I. Periodic variable stars coincident with bright sources from ROSAT all sky survey
M. Kiraga
Photometric data from the ASAS - South (declination less than 29 deg) survey have been used for identification of bright stars located near the sources from the ROSAT All Sky Surve…