Search Publications
CPCS 2.0 — new automatic tool for time-domain astronomy
Rybicki, K.; Wyrzykowski, Ł.; Zieliński, P. +3 more
The Cambridge Photometric Calibration Server (CPCS) has been designed to respond to the need of automated rapid photometric data calibration and dissemination for transient events, primarily from Gaia space mission. The Calibration Server has been in operation since 2013 and has been used to calibrate around 50 000 observations of hundreds of tran…
Improvement of positional accuracy of Solar system bodies ground-based observations with CCD-imaging of close approaches of them with Gaia stars
Bikulova, D. A.
Current release of the Gaia mission provides representation of a new reference frame on an unprecedent level of accuracy. This astrometric catalogue is practically free of systematic errors with respect to astrometric ground-based observations. First applications Gaia DR1 and Gaia DR2 as a reference in an analysis of CCD-observations of asteroids …
Independent study and spectral classification of a sample of poorly studied high proper motion M-dwarf candidate stars
Merc, J.; Csörnyei, G.; Cabello, C. +2 more
We report an independent spectral classification of a sample of poorly studied M-dwarf candidate stars observed with the OSIRIS instrument at GTC. Our project was carried out as an independent test of the spectral classification. It is crucial for the studies of extrasolar planets orbiting M-dwarfs, since properties of the host star are directly r…
Photometric and spectroscopic investigation of nine Cepheids in the Cassiopeia constellation
Handler, G.; Zejda, M.; Paunzen, E. +3 more
We present new multicolor BVRI photometry and low-resolution spectroscopy of 9 fundamental mode Cepheids in the Cassiopeia constellation. Observations were carried out during the 2017/2018 observing season. We investigated each particular light curve in detail using Fourier decomposition techniques which we compare with the Cepheids from the OGLE …
Galactic astronomy and small telescopes
Zwitter, T.
The second data release of ESA's Gaia satellite (Gaia DR2) revolutionised astronomy by providing accurate distances, proper motions, apparent magnitudes, and in many cases temperatures and radial velocities for an unprecedented number of stars. These new results, which are freely available, need to be considered in virtually any stellar research p…
Analysis of exoplanetary system WASP-118
Fedurco, M.; Vaňko, M.; Parimucha, Š. +1 more
We present a new study of a recently discovered exoplanetary system WASP-118. The system consists of an F-type star and a close-in giant planet (an inflated hot Jupiter). Using Kepler-K2 observations, we re-determined the orbital and physical parameters of the system. Our results are in good agreement with the values published in the literature. T…
Search for new variable stars in the northern sky
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š. +5 more
With the aim to find and characterize new variable stars, we obtained 24 470 CCD images in 13 fields of 0.4 square degrees with a 35/51 cm Maksutov-type semi-robotic telescope at the Molėtai Astronomical Observatory of Vilnius University. From photometric time series of 3604 stars analysed, we found 11 periodic variable stars and 70 slowly varying…
Investigating the OB associations in CMa using eclipsing binary systems: Preliminary results on LV CMa
Bakış, V.; Tunç, E.
In this study, an eclipsing binary of a short orbital period (P = 1.d1834857) LV CMa (V = 8.m7) is selected as a candidate member of an association in the direction of CMa OB1/R1 region. Light curves in UBVRcIc photometric bands were obtained and low-resolution (R ∼ 5500) spectra were collected. Prelimin…
Long-term spectroscopic survey of T Tauri stars in the Taurus-Auriga star-forming region
Kundra, E.; Budaj, J.; Guenther, E. +5 more
Long-term spectroscopic monitoring of 22 T Tauri stars located in the Taurus-Auriga star-forming region (SFR) is presented. The medium and high-dispersion spectra were obtained at the Stará Lesná (SLO), Skalnaté Pleso (SPO) and Tautenburg observatory (TLS) during 2015—2018. The broadening function technique was used to determine the radial and pro…