Abstract Details
| Name: RAGHU PRASAD Affiliation: Osmania University, Hyderabad Conference ID: ASI2019_349 Title : First Photometric and Spectroscopic study of a pre-contact binary TYC 809-569-1 Authors and Co-Authors : RAGHU PRASAD M, RUKMINI J, D SHANTI PRIYA Abstract Type : Poster Abstract Category : Stars, ISM and Galaxy Abstract : Pre-contact binaries are important sources lying in a key evolutionary stage of the mass transfer in close binary systems and thus are good targets to study. From the studies correlating metallicities and ages, it is hypothesized that contact binaries need a long term pre-contact evolution ranging from few hindered million to billion years, while the formation and evolution of these systems are modelled by study but slow angular momentum loss via magnetic breaking, eventually leading to deep contact and mergers. Photometric and spectroscopic investigation of variable TYC 809-569-1 is studied and presented. The photometric data was analysed using WD method which shows that the variable is a pre-contact binary. The object displays a peculiar O’Connell effect with a mysterious spot activity. The phase dependent H-alpha variation and its correlation with spot activity is discussed. The evolutionary state of the binary is discussed with respect to the absolute parameters and existing evolutionary models. Key words: Pre-contact binary, O’ Connell effect, Photometry and Spectroscopy. |