The Bima Project: O-C Diagrams of Eclipsing Binary Systems

Abstract

NARIT) has joined the BIMA Project as the main partner. This project aims to build an open-database of eclipsing binary minima and to establish the orbital period of each system and its variations. The project is conducted on the basis of multisite monitoring observations of eclipsing binaries with magnitudes less than 19 mag. Differential photometry methods have been applied throughout the observations. Data reduction was performed using IRAF. The observations were carried out in BVRI bands using three different small telescopes situated in Indonesia, Thailand, and Chile. Computer programs have been developed for calculating the time of minima. To date, more than 140 eclipsing binaries have been observed. From them 71 minima have been determined. We present and discuss the O-C diagrams for some eclipsing binary systems.

Fundamental Parameters of the Eclipsing Binary TU Canis Majoris

“…In Kukarkin et al (1969) Pojmanski 2003) and the analysis of the epochs of 42 light minima, including three secondary eclipses by Haans et al (2015) concludes that the system has a constant orbital period, and that the real period is longer than the orbital period published in Mallama (1980) The GAIA first data release gives a parallax of 0 00316±0.00025 for the system, which means a distance of 316.55±24.68 pc (Gaia Collaboration et al 2016).…”

“…=+ ´( ) is proposed byHaans et al (2015) without reporting errors for the orbital period and epoch of primary minimum.…”

“…Fixed parameters are labeled with *. • fromHaans et al (2015). (A color version of this figure is available in the online journal.…”