Oral Presentation

The BIMA Project: Analysis of O-C Diagram on AO Vel

Irham T. Andika(1), D. G. Ramadhan(1), E. Puspitaningrum(1), G. K. Haans(2), S. Akhyar(2), P. Irawati(3), R. Azaliah2, T. Sarotsakulchai(3), J. Suherli(4), H. L. Malasan(1,2), A. Richichi(3) and B. Soonthornthum(3)

Eclipsing Binaries' Minima (BIMA) Monitoring Project aims to observe eclipsing binaries' minima and to build database of their orbital periods and variations over time. All of the observations are done using CCD photometry method in BVRI bands and we proceed to analyze the data using IRAF with aperture photometry technique. 71 minima of more than 30 eclipsing binaries has been observed during late 2012 until September 2014. In the course of two years, BIMA project has established all the technique required to do the whole science of eclipsing binaries’ minima observations, from the observational and data handling maximization to the image reduction and O-C (Observed – Calculated) diagram analysis. O-C diagram is used to see whether our prediction about something is matched with the observation. In this case, we use the O-C diagram to test our prediction of the eclipsing binaries’ period and to make any corrections needed on the system’s period. In this paper, we present the O-C diagram and analysis of AO Vel (=HD68826) system. AO Vel was classified as an Algol type eclipsing binary with detected apsidal motion. It is important to observe this system and to look at its O-C diagram to understand the nature the system.

Keywords: methods: observational, techniques: photometric, stars: binaries: eclipsing



*Note for affiliation in authors column:
(1)Astronomy Study Program, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia
(2)Bosscha Observatory, Institut Teknologi Bandung, Indonesia
(3)National Astronomical Research Institute of Thailand, Chiang Mai, Thailand
(4)Astronomy Department, Wesleyan University, Middletown, CT, U.S.A