50 citations · 358 across the 22 of their papers we have counts for
18 papers · 1 filter
Apsidal motion and TESS light curves of three southern close eccentric eclipsing binaries: GM Nor, V397 Pup, and PT Vel
M. Wolf, P. Zasche, J. Kára +10
New ground-based and space-based photometric data have been obtained and archival spectroscopic measurements were used in this study of three detached early-type and southern-hemis…
Periodic variable A-F spectral type stars in the northern TESS continuous viewing zone
M. Skarka, J. Žák, M. Fedurco +11
The goal of our study is to provide a reliable classification of variability of A-F stars brighter than 11 mag located in the northern TESS continuous viewing zone. We also aim at…
Study of Eclipsing Binary and Multiple Systems in OB Associations V: MQ Cen in Crux OB1
V. Bakis, Z. Mikulasek, J. Janik +6
The early-type massive binary MQ Cen (P=3.7 d) has been investigated by means of high-resolution () spectral analysis and multi-band (Johnson and Ström…
Candidates for RR~Lyrae in binary systems from the OGLE Galactic bulge survey
Z. Prudil, M. Skarka, J. Liška +2
We present 20 newly discovered candidates for binary systems with an RR~Lyrae companion. Using the photometric data from the Optical Gravitational Lensing Experiment (OGLE) and Kor…
A cautionary tale of interpreting O-C diagrams: period instability in a classical RR Lyr Star Z CVn mimicking as a distant companion
M. Skarka, J. Liška, R. Dřevěný +4
We present a comprehensive study of Z CVn, an RR Lyrae star that shows long-term cyclic variations of its pulsation period. A possible explanation suggested from the shape of the O…
New inclination changing eclipsing binaries in the Magellanic Clouds
J. Juryšek, P. Zasche, M. Wolf +8
Context: Multiple stellar systems are unique laboratories for astrophysics. Analysis of their orbital dynamics may reveal invaluable information about the physical properties of th…
Binary systems with an RR Lyrae component - progress in 2016
J. Liška, M. Skarka, Á. Sódor +1
In this contribution, we summarize the progress made in the investigation of binary candidates with an RR Lyrae component in 2016. We also discuss the actual status of the RRLyrBin…
KIC 2831097 - A 2-year orbital-period RR Lyrae binary candidate
Á. Sódor, M. Skarka, J. Liška +1
We report the discovery of a new Kepler first-overtone RR Lyrae pulsator, KIC 2831097. The pulsation shows large, 0.1 d amplitude, systematic phase variations that can be interpret…
The SERMON project: 48 new field Blazhko stars and an investigation of modulation-period distribution
Marek Skarka, Jiří Liška, Reinhold F. Auer +3
We investigated 1234 fundamental mode RR Lyrae stars observed by the All Sky Automated Survey (ASAS) to identify the Blazhko (BL) effect. A sample of 1547 BL stars from the literat…
Analysis of the multiple system with CP component phi Draconis
J. Liska
The star phi Dra comprises a spectroscopic binary and a third star that together form a visual triple system. It is one of the brightest chemically peculiar (CP) stars of the upper…
RR Lyrae stars in eclipsing systems - historical candidates
J. Liska, M. Skarka, P. Hajkova +1
Discovery of binary systems among RR Lyrae stars belongs to challenges of present astronomy. So far, none of classical RR Lyrae stars was clearly confirmed that it is a part of an…
Modelling of variability of the chemically peculiar star phi Draconis
Milan Prvák, Jiří Liska, Jiří Krtička +2
Context: The presence of heavier chemical elements in stellar atmospheres influences the spectral energy distribution (SED) of stars. An uneven surface distribution of these elemen…
Cyclic variations in O-C diagrams of field RR Lyrae stars as a result of LiTE
Jiri Liska, Marek Skarka, Miloslav Zejda +2
This paper presents an extensive overview of known and proposed RR Lyrae stars in binaries. The aim is to revise and extend the list with new Galactic field systems. We utilized ma…
Possible candidates for multiple occurrence of variable stars in the VSX catalogue
Jiri Liska, Marek Skarka, Reinhold Friedrich Auer +2
A paper about variable stars with possible multiple occurrence in the VSX catalogue is presented. Our main criteria for identification of such duplicities were the angular distance…
New analysis of the light time effect in TU Ursae Majoris
Jiri Liska, Marek Skarka, Zdenek Mikulasek +2
We investigate in detail the LiTE of the most probable binary candidate TU UMa. We used a new code applied on previously available and newly determined maxima timings to confirm bi…
Apsidal motion and light a curve solution for eighteen SMC eccentric eclipsing binaries
P. Zasche, M. Wolf, J. Vrastil +3
Aims: The Danish 1.54-meter telescope at the La Silla observatory was used for photometric monitoring of selected eccentric eclipsing binaries located in the Small Magellanic Cloud…
Catalogue of variable stars in open cluster fields
Miloslav Zejda, Ernst Paunzen, Bernhard Baumann +2
We present the first catalogue of known variable stars in open cluster regions and with up to two times the given cluster radius. This gives basic information about the distributio…
Surprising variations in the rotation of the chemically peculiar stars CU Virginis and V901 Orionis
Zdenek Mikulasek, Jiri Krticka, Gregory W. Henry +13
CU Vir and V901 Ori belong among these few magnetic chemically peculiar stars whose rotation periods vary on timescales of decades. We aim to study the stability of the periods in…