Bulletin de la Société Royale des Sciences de Liège Bulletin de la Société Royale des Sciences de Liège -  Volume 87 - Année 2018  Actes de colloques  First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - November 2016 - Nainital, India 

Period variation studies of six contact binaries in M4

Jagirdar Rukmini
Department of Astronomy, Osmania University, Hyderabad, Telangana – 500007, rukminiouastro@yahoo.com
Devarapalli Shanti Priya
Department of Astronomy, Osmania University, Hyderabad, Telangana – 500007, astroshanti@gmail.com

Abstract

We present the first period study of six contact binaries in the closest globular cluster M4 the data collected from June 1995−June 2009 and Oct 2012−Sept 2013. New times of minima are determined for all the six variables and eclipse timing (O-C) diagrams along with the quadratic fit are presented. For all the variables, the study of (O-C) variations reveals changes in the periods. In addition, the fundamental parameters for four of the contact binaries obtained using the Wilson-Devinney code (v2003) are presented. Planned observations of these binaries using the 3.6-m Devasthal Optical Telescope (DOT) and the 4-m International Liquid Mirror Telescope (ILMT) operated by the Aryabhatta Research Institute of Observational Sciences (ARIES; Nainital) can throw light on their evolutionary status from long term period variation studies.

Keywords : astronomy, astrophysics, binaries, photometry, stars, variability

Pour citer cet article

Jagirdar Rukmini & Devarapalli Shanti Priya, «Period variation studies of six contact binaries in M4», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 87 - Année 2018, Actes de colloques, First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - November 2016 - Nainital, India, 198 - 202 URL : https://popups.uliege.be/0037-9565/index.php?id=7646.