Time of Minima Analysis of Eclipsing Binaries MV Car, V0604 Car, AD CnC, MQ CnC, and KV Gem E. I. Akbar(a*), A. T. Mandala(a), N. F. Nurindra(a), F. A. Firmansyah(a), A.S. Chandradewani(a), H. L. Malasan(a,b), B. D. S. Budi (c), P. Irawati (d)
a) Astronomy Study Program, Institut Teknologi Bandung, Indonesia
*evan[at]itb.ac.id
b) Bosscha Observatory, Indonesia
c) The Graduate University for Advanced Studies, SOKENDAI, Japan
d) National Astronomical Research Institute of Thailand, Thailand
Abstract
We present 30 times of minima for five short-period eclipsing binaries. The observational data were collected using the Thai Robotic Telescope (TRT) network between January and April 2024. The times of minima were calculated using the Kwee-van Woerden method. We also used data from ASAS, TESS, and the AAVSO^s Bob Nelson O-C database to perform O-C analysis and determine the orbital periods of these systems. The O-C diagram for KV Gem shows a changing period in a cyclic phenomenon, suggesting mass transfer between the stars, apsidal motion, or the presence of a third body. The O-C diagram for MQ CnC and AD CnC shows a straight line going downward, indicating shorter period change. As for the V0604 Car and MV Car, there were no times of minima reported before, so further analysis cannot be done. This work is part of the BIMA project, a collaborative effort between Bosscha Observatory and the National Astronomical Research Institute of Thailand (NARIT).
Keywords: eclipsing binary, time of minima, O-C diagram
