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Deep investigation of a pair of open clusters NGC 7031 and NGC 7086 utilizing Gaia DR3
Elsanhoury, W. H.; Haroon, A. A.; Elkholy, E. A. +1 more
In this paper, we carried out photometric and kinematic study of two poorly studied open clusters NGC 7031 and NGC 7086 utilizing the optical wavelength of Gaia DR3. We identified 613 and 226 candidates for respective clusters as highly probable astrometric members. Fitting King's profile within RDPs, we estimate both core and limiting radii. For …
Confirming long-period transiting exoplanets with TESS and CHEOPS. The case of HD 22946 d
Osborn, H. P.; Garai, Z.; Ulmer-Moll, S. +2 more
Due to the limited observing duration of the Transiting Exoplanet Survey Satellite (TESS) primary mission, which observed the majority of the near-ecliptic sectors for only 27 days, planets on long periods produce only single transits. However, thanks to its extended mission, TESS re-observed the same fields 2 years later, and in many cases was ab…
Identifying Ae/Be stars in Gaia low-resolution BP/RP spectra
Paunzen, E.; Prišegen, M.; Bernhard, K. +2 more
Classical Be, and Herbig Ae/Be stars are mainly characterized by emission in the Hα and Hβ lines. These lines are essential to understanding the formation of massive stars and describing mass loss and stellar winds during stellar evolution. This study aims to characterize and detect classical Be and Herbig Ae/Be stars in Gaia BP/RP spectra, which …
First determination of the system parameters in five contact binaries
Dębski, B.; Kulczycka, L.; Skrobacz, W. +2 more
We present solutions of the BVRI-light curve numerical modeling for five low-mass ratio totally eclipsing contact binary stars. One object required the introduction of a cool star spot to the best-fitting model. Only one object returned a solution with a hotter secondary component. None of the objects required the introduction of a third component.
Spotted eclipsing binary KIC 7023917 with δ-Scuti pulsations
Parimucha, Š.; Gajdoš, P.; Kamenec, M.
Eclipsing binary KIC 7023917 is one of nearly three thousand other binaries in the well-known Kepler Eclipsing Binary Catalog. However, it has some uncommon features. We focused on this system because we detected fast anti-correlated changes on the O-C diagram which could suggest the presence of apsidal motion. However, these changes are very fast…
Synthetic light curves and orbital solutions of two eclipsing binary systems, V675 Lac and USNO-A2.0 1425-02035807
Elkhateeb, M. M.; Alenazi, M. S.
We carried out light curve modeling for all-light curves of the variable W UMa systems V675 Lac and USNO-2035807 using ground-based observations, the Gaia 3rd data release, and ZTF databases by means of the W-D code. The accepted models revealed absolute and physical parameters, which showed that the primary components in both systems are massive …
ObsMap: Preparing observing maps with the best comparison stars for photometry
Esmer, E. M.; Baştürk, Ö.; Yalçınkaya, S.
We present ObsMap, a Python framework that allows for the interactive creation of various alternative observation maps to maximize the potential of each observing night. The code requires the user to input the star's name or equatorial coordinates, the passband of observation, field of view (FoV), and desired count level together with the minimum …
A variety of binary targets for small telescopes
Miroshnichenko, A. S.; Zharikov, S.; Danford, S. +10 more
Results are reviewed of a long-term program of binary systems observing since 2013 at the 0.81 m telescope of the Three College Observatory in North Carolina, USA, with an échelle spectrograph at a medium spectral resolution. The target list includes recognized and suspected binary systems with normal stars (no spectral lines in emission), classic…
The possible dual nature of the asteroid (12499) 1998 FR47
Borisov, G.; Kostov, A.; Todorović, N. +2 more
We present the R-band lightcurves of the Flora family asteroid (12499) 1998 FR47, obtained in 2022 at two different astronomical sites: Bulgarian National Astronomical Observatory Rozhen (MPC Code 071) and Astronomical Station Vidojevica (MPC Code C89). The quadramodal lightcurves reveal a rotation period of 6.172±0.003 h and an amplitude of about…