21 citations · 59 across the 10 of their papers we have counts for
10 papers
The SRG/eROSITA All-Sky Survey DR2: Cumulative X-ray catalogues from the first three surveys and multi-wavelength counterparts in the western Galactic hemisphere
M. E. Ramos-Ceja, G. Lamer, M. Salvato +111
The eROSITA telescope array on board the Spektrum-Roentgen-Gamma (SRG) mission began its all-sky survey program in December 2019, scanning the sky at an approximately six-month cad…
Photometric Modulations on Intermediate Timescales in the Symbiotic Binaries
Melis Yardımcı, Samet Ok, Belinda Kalomeni
We present a multi-band study of three symbiotic binaries using combined ground- and space-based monitoring that spans up to 14 years. These datasets enable a systematic investigat…
A star-by-star correspondence between X-ray activity and rotation in the young open cluster NGC 2516 with eROSITA
Dario J. Fritzewski, Sydney A. Barnes, Samet Ok +2
The coronal soft X-ray emission of cool stars, especially when taken in combination with their measured rotation periods, offers insights into their levels of magnetic activity and…
X-ray and Optical Analysis of the Prototype Polar AN UMa
S. Ok, M. Yardimci, B. Kalomeni +1
We present a long-term optical and X-ray photometric study of AN UMa, one of the prototypical polar-type cataclysmic variables, tracing more than 34 years of its accretion history.…
Discovery of the magnetic cataclysmic variable XMM J152737.4-205305.9 with a deep eclipse-like feature
Samet Ok, Axel Schwope, David A. H. Buckley +1
In this study, we report a discovery from XMM-Newton, which involves the identification and subsequent examination of a newly discovered polar-type cataclysmic variable named XMM J…
Serendipitous discovery of the magnetic cataclysmic variable SRGE J075818-612027
Samet Ok, Georg Lamer, Axel Schwope +5
We report the discovery of SRGE J075818-612027, a deep stream-eclipsing magnetic cataclysmic variable found serendipitously in SRG/eROSITA CalPV observations of the open cluster NG…
XMM-Newton and TESS observations of the highly variable polar V496 UMa
Samet Ok, Axel Schwope
We aim to study the temporal and spectral behaviour of \vum from the optical to the X-ray regimes. We used archival \xmmn and \tes observations obtained in 2017 and 2019 to perform…
XMM-Newton observations of eleven intermediate polars and possible candidates
Hauke Wörpel, Axel Schwope, Iris Traulsen +2
We aim to identify new intermediate polars (IPs) in XMM-Newton observations from a list of promising candidates. By selecting targets not previously known to be X-ray bright we aim…
V902 Monocerotis: a likely disc-accreting intermediate polar
H. Worpel, A. D. Schwope, I. Traulsen +2
Aims: We aim to confirm whether the eclipsing cataclysmic variable V902 Mon is an Intermediate Polar, to characterise its X-ray spectrum and flux, and to refine its orbital ephemer…
Fundamental properties of solar-like oscillating stars from frequencies of minimum : I. Model computations for solar composition
M. Yıldız, Z. Çelik Orhan, Ç. Aksoy +1
Low amplitude is the defining characteristic of solar-like oscillations. The space projects and give us a great opportunity to successfully detect such oscillation…