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The New Ephemeris and Light Curve Analysis of V870 Ara by the Ground-Based and TESS Data

Davoudi, Fatemeh; Poro, Atila; Blackford, Mark G. +4 more

New CCD photometric observations and their investigation of the W UMa-type binary, V870 Ara, are presented. Light curves of the system were taken through BVIfilters from the Congarinni Observatory in Australia. The new ephemeris is calculated based on seven new determined minimum times, together with the TESS data and others compiled from the lite…

Application of clustering algorithm to wide stellar pairs for unsupervised search of parts of disrupting clusters

Kovaleva, Dana; Sapozhnikov, Sergei

We introduce the application of the clustering algorithm to the preliminary compiled list of probable wide pairs of co-moving stars. The main aim of such development is a possibility of unsupervised blind search of coeval loose stellar structures over significant regions in space. Using Gaia EDR3 data, we investigated the application of the method…

Fitting procedure for estimating interstellar extinction at high galactic latitudes

Malkov, Oleg; Kovaleva, Dana; Avdeeva, Aleksandra +1 more

We determine the interstellar extinction in the selected high-latitude areas of the sky based on Gaia EDR3 astrometry and photometry and spectroscopic data from RAVE survey. We approximate the results with the cosecant law in each area thus deriving the parameters of the barometric formula for different lines of sight. The distribution of the para…