9 papers
Cluster Membership Probabilities: A Review of Methods and Gaia Applications
Tahereh Ramezani, Johana Balciráková, Prapti Mondal +3
Reliable stellar-cluster membership is essential for deriving cluster ages, distances, reddenings, metallicities, mass functions, dynamical parameters, and Galactic-structure trace…
Tidal Tails of Galactic Open Clusters: A Review of Methods, Evidence, and Sources of Disagreement
Tahereh Ramezani, Prapti Mondal, Johana Balciráková +4
Tidal tails are a natural consequence of the dynamical evolution of open clusters in the Galactic tidal field, but their observational identification is intrinsically difficult bec…
The different methods to calculate cluster membership probabilities
Tahereh Ramezani, Prapti Mondal, Katerina Neumannova +3
Reliable membership determination is a fundamental step in the study of star clusters. With the advent of astrometry, a wide range of statistical and machine-learning techni…
Cluster characteristics of Galactic open clusters
K. Neumannová, J. Supíková, N. Faltová +4
Star clusters are perfectly suited for studying the formation, evolution, and dynamics of stars and their host galaxies. For this, we need to estimate total masses, radii and shape…
A Homogeneous Determination of the Interstellar Extinction Law and Metallicity for 105 Galactic Open Clusters
Tahereh Ramezani
This work presents an investigation of the interstellar extinction law toward 105 Galactic open clusters using ultraviolet-optical photometry. The photometric dataset and reddening…
Ultraviolet Photometry and Reddening Estimation of 105 Galactic Open Clusters
Tahereh Ramezani, Ernst Paunzen, Artem Gorodilov +1
This paper focuses on observing unstudied Galactic open clusters in the Ultraviolet (UV) wavelength range and analyzing their photometric data. The Gaia Data Release 3 (DR3) enable…
Estimation of radial velocities of BHB stars
Tahereh Ramezani, Ernst Paunzen, Caiyun Xia +2
We studied blue horizontal branch stars (BHBs), and calculated their radial velocities. Spectra of these stars have been obtained with moderate signal-to-noise ratio for five blue…
A New Approach to Find the Böhm-Vitense gap
Tahereh Ramezani, Ernst Paunzen, Martin Piecka +1
This paper discusses the B{ö}hm-Vitense gap, a gap in the colours of stars that occurs when the atmosphere changes from radiative to convective in deep layers. We are using differe…
Quick Ultra-VIolet Kilonova surveyor (QUVIK)
N. Werner, J. Řípa, F. Münz +36
We present a near-UV space telescope on a ~70kg micro-satellite with a moderately fast repointing capability and a near real-time alert communication system that has been proposed…