Current and future capabilities of the 74-inch telescope of Kottamia astronomical observatory in Egypt

Azzam, Yosry A.; Ali, Gamal B.; Elnagahy, Farag I. Y.; Ismail, Hisham; Haroon, A. A.; Selim, I. M.; Ahmed-Essam,

doi:10.48550/arxiv.1402.2926

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“…It utilizes a 1.88 m telescope that operates in Newtonian (f/4.9) and Cassegrain (f/18) foci. An upgrade of the optical system and a refurbishment of the entire telescope control system was implemented in 2008 (Azzam et al 2014), enabling computer control of both dome and telescope. The recently developed 'Kottamia Faint Imaging Spectro-Polarimeter' (KFISP) operates as a multi-purpose Cassegrain instrument, that incorporates a 2 http://observatory.phys.uoa.gr 3 http://helmos.astro.noa.gr 4 http://kryoneri.astro.noa.gr 5 http://www.nriag.sci.eg focal reducer and creates an effective focal ratio of f/6.…”

Section: The Observing Strategymentioning

confidence: 99%

CoBiToM Project -- I. Contact Binaries Towards Merging

Gazeas,

Loukaidou,

Niarchos

et al. 2021

Preprint

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Binary and multiple stellar systems are numerous in our solar neighborhood with 80 per cent of the solar-type stars being members of systems with high order multiplicity. The Contact Binaries T owards Merging (CoBiToM) Project is a programme that focuses on contact binaries and multiple stellar systems, as a key for understanding stellar nature. The goal is to investigate stellar coalescence and merging processes, as the final state of stellar evolution of low-mass contact binary systems. Obtaining observational data of approximately 100 eclipsing binaries and multiple systems and more than 400 archival systems, the programme aspires to give insights for their physical and orbital parameters and their temporal variations, e.g. the orbital period modulation, spot activity etc. Gravitational phenomena in multiple-star environments will be linked with stellar evolution. A comprehensive analysis will be conducted, in order to investigate the possibility of contact binaries to host planets, as well as the link between inflated hot Jupiters and stellar mergers. The innovation of CoBiToM Project is based on a multi-method approach and a detailed investigation, that will shed light for the first time on the origin of stellar mergers and rapidly rotating stars. In this work we describe the scientific rationale, the observing facilities to be used and the methods that will be followed to achieve the goals of CoBiToM Project and we present the first results as an example of the current research on evolution of contact binary systems.

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Section: The Observing Strategymentioning

confidence: 99%