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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.


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.


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.


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.


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.


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.


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