Available OEJV publications
B.R.N.O. CONTRIBUTIONS #41 - TIMES OF MINIMA
M. Lehký, K. Hoňková, L. Šmelcer, M. Souza de Joode, F. Bílek, et al.
OEJV Issue 211 (21.01.2021):
Article
Data
DOI
Abstract
This paper presents 2109 times of minima for 965 objects acquired by 59 members and cooperating observers of the Variable Star and Exoplanet Section of the Czech Astronomical Society (B.R.N.O. Observing project). These observations were submitted to the website of the Variable Star and Exoplanet Section of the Czech Astronomical Society between November 2016 and March 2018.
Abstract
This paper presents 2109 times of minima for 965 objects acquired by 59 members and cooperating observers of the Variable Star and Exoplanet Section of the Czech Astronomical Society (B.R.N.O. Observing project). These observations were submitted to the website of the Variable Star and Exoplanet Section of the Czech Astronomical Society between November 2016 and March 2018.
NEW ECLIPSING BINARY TIMES OF MINIMA IN THE NORTHERN SKY MEASURED DURING THE YEAR 2020
R.F. Auer
OEJV Issue 210 (14.01.2021):
Article
Data
DOI
Abstract
We present 167 times of minima of 69 eclipsing binaries in the Northern Sky determined from differential, partly multicolor photometry, during the year 2020.
Abstract
We present 167 times of minima of 69 eclipsing binaries in the Northern Sky determined from differential, partly multicolor photometry, during the year 2020.
CK AQR TIME KEEPING. EVIDENCE FOR A THIRD BODY
M. Bonnardeau
OEJV Issue 209 (30.12.2020):
Article
Photometry
ToM
DOI
Abstract
Photometric measurements of the contact binary system CK Aqr are presented. 49 new times of minimum were obtained between 2005 and 2020. Along with already published observations, this allows the derivation of an improved ephemeris. The resulting O-C diagram shows oscillations which are interpreted as the light time travel effect due to a third component, with a period of 8.2 years.
Abstract
Photometric measurements of the contact binary system CK Aqr are presented. 49 new times of minimum were obtained between 2005 and 2020. Along with already published observations, this allows the derivation of an improved ephemeris. The resulting O-C diagram shows oscillations which are interpreted as the light time travel effect due to a third component, with a period of 8.2 years.
PROCEEDINGS OF THE 51st CONFERENCE ON VARIABLE STARS RESEARCH
Editor-in-chief: R. Kocián
OEJV Issue 208 (10.11.2020):
Article
DOI
Abstract
The Variable Star and Exoplanet Section of the Czech Astronomical Society organized traditional autumn conference on research and news in the field of variable stars. The conference was held in a comfortable space of Ostrava Planetarium. In addition to the many contributions that were presented on site, we had the opportunity to hear lectures of invited speakers from abroad via Internet transmission. All presented contributions can be viewed on our YouTube channel.
Abstract
The Variable Star and Exoplanet Section of the Czech Astronomical Society organized traditional autumn conference on research and news in the field of variable stars. The conference was held in a comfortable space of Ostrava Planetarium. In addition to the many contributions that were presented on site, we had the opportunity to hear lectures of invited speakers from abroad via Internet transmission. All presented contributions can be viewed on our YouTube channel.
THE BRIGHT ECLIPSING BINARY NSV 4031 IS NOT VARIABLE
Ch. Lloyd, D. Conner, R. Pickard, E. N. Walker
OEJV Issue 207 (10.11.2020):
Article
DOI
Abstract
Observations of the supposed eclipsing binary NSV 4031 from time-series photometry
and data from several synoptic instruments show no evidence of an eclipse or any
periodic variation with an amplitude above 0.05 magnitudes. The spectral energy distribution
of the star is very closely matched to a spectral type of F5IV.
Abstract
Observations of the supposed eclipsing binary NSV 4031 from time-series photometry and data from several synoptic instruments show no evidence of an eclipse or any periodic variation with an amplitude above 0.05 magnitudes. The spectral energy distribution of the star is very closely matched to a spectral type of F5IV.
FOUR CANDIDATE BINARY STARS WITH STRONG REFLECTION EFFECT FROM THE ZWICKY TRANSIENT FACILITY
K. Bernhard, S. Hümmerich
OEJV Issue 206 (09.11.2020):
Article
DOI
Abstract
We present five stars from the ZTF Catalogue of Periodic Variable Stars whose properties are fully compatible with variable stars of GCVS-type R, that is, short-period binary systems with light variations dominated by strong reflection effect. If verified by spectroscopic studies, our results show that the variability amplitude limit of 1.0 mag (V) currently listed in the International Variable Star Index can be exceeded and may be in need of revision.
NEW CCD TIMES OF MINIMA OF ECCENTRIC ECLIPSING BINARY SYSTEMS IN 2017-2019
M.-J. Jeong, C.-H. Kim, M.-H. Song, E.-C. Sung, J.-H. Park, K.-Y. Han, T.-S. Jeong, C. Han
OEJV Issue 205 (07.11.2020):
Article
Data
DOI
Abstract
We present 88 times of minima for 56 eccentric eclipsing binary systems determined from photometric observations at the Sobaeksan Optical Astronomical Observatory (SOAO) in Republic of Korea from February 2017 to December 2019.