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CoBiToM project – I. Contact binaries towards merging

By |2021-12-15T14:26:10+02:00January 29th, 2021|

Binary and multiple stellar systems are numerous in our solar neighbourhood with 80 per cent of the solar-type stars being members of systems with high order multiplicity. The Contact Binaries Towards 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 ...

Asteroseismology of two Kepler detached eclipsing binaries

By |2021-07-16T03:51:02+03:00October 9th, 2020|

The present work contains light curve, spectroscopic, and asteroseismic analyses for KIC 04851217 and KIC 10686876. These systems are detached eclipsing binaries hosting a pulsating component of δ Scuti type and have been observed with the unprecedented accuracy of the Kepler space telescope. Using ground-based spectroscopic observations, the spectral types of the primary components of the systems were estimated as A6V and A5V for KIC 04851217 and KIC 10686876, respectively, with an uncertainty of one subclass. The present spectral classification, together with literature radial velocity curves, were used to model the light curves of the systems and, therefore, to calculate the absolute parameters of their ...

Two new nova shells associated with V4362 Sagittarii and DO Aquilae

By |2021-07-16T03:45:52+03:00September 21st, 2020|

A classical nova is an eruption on the surface of a white dwarf in an accreting binary system. The material ejected from the white dwarf surface generally forms an axisymmetric shell. The shaping mechanisms of nova shells are probes of the processes that take place at energy scales between planetary nebulae and supernova remnants. We report on the discovery of nova shells surrounding the ...

ARISTARCHOS telescope contributes to the discovery of new exoplanets

By |2021-10-10T23:43:33+03:00April 24th, 2020|

ARISTARCHOS telescope contributes to the discovery of new exoplanets In April 2020, a scientific paper (https://arxiv.org/abs/2004.06622) was published in the Astronomical Journal by an international team of researchers led by Benjamin F. Cooke. The work concerns the discovery of two new exoplanets of the type "Hot Jupiter" (Hot Jupiters) around the stars [...]

Optical Surfaces supplied the National Observatory of Athens with precision lenses for the Aristarchos Telescope

By |2021-10-10T23:39:02+03:00September 9th, 2016|

Optical Surfaces supplied the National Observatory of Athens with precision lenses for the Aristarchos Telescope Optical Surfaces supplies wide-field imaging lenses for Aristarchos Telescope The Aristarchos Wide-Field Camera (AWFC) is a new wide-field imager that will be used on the 2.3m Aristarchos telescope at the Helmos Observatory in Greece. It [...]

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