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First TESS light curve solution and orbital period analysis of V567 And
Öztürk, Oğuz
The photometric light curve of V567 And observed by the Transiting Exoplanet Survey Satellite (TESS) was solved for the first time in this study. According to the final model parameters, it was concluded that the system is a semi-detached eclipsing binary star system. The mass and radius values of the primary and secondary components were estimate…
A dynamical evolution study of the open clusters: Berkeley 10, Berkeley 81, Berkeley 89 and Ruprecht 135
Çakmak, Hikmet; Karataş, Yüksel
By utilizing Gaia EDR3 photometric/astrometric data, we studied the dynamical evolution from the obtained astrophysical, structural and dynamical parameters of the open clusters (OCs), Berkeley 10 (Be 10), Berkeley 81 (Be 81), Berkeley 89 (Be 89), and Ruprecht 135 (Ru 135). The Gaia EDR3 photometric distances from the isochrone fitting method are …
A Search for recurrent novae among Far Eastern guest stars
Hoffmann, Susanne M.; Vogt, Nikolaus
According to recent theoretical studies, classical novae are expected to erupt every ∼ 105 years, while the recurrence time scale of modern recurrent novae (Nr) stars ranges from 10 to ∼ 100 years. To bridge this huge gap in our knowledge (three orders of magnitude in time scales), it appears attractive to consider historical…
Automatic detection of accretion bursts in young stellar objects: A new algorithm for long-term sky surveys
Altavilla, G.; Nucita, A.; Lorenzetti, D. +4 more
Young stellar objects in their pre-main sequence phase are characterized by irregular changes in brightness, generally attributed to an increase of the mass accretion rate due to various kind of instabilities occurring in the circumstellar disk. In the era of large surveys aimed to monitor the sky, we present a pipeline to detect irregular bursts,…
Studying young stellar populations in G345.5+1.5 molecular cloud
Baume, G.; Borissova, J.; Ramirez Alegria, S.
Using different sky surveys, we studied IRAS sources and embedded clusters located in the G345.5+1.5 region. Our analysis comprises multi-wavelength (optical to radio) data, exploited using various methods: photometry, near-infrared spectroscopy for ten stars in the embedded cluster DBS-114, and astrometry. We estimated the main parameters of the …
The first photometric analysis study of the GW Psc binary system
Tanrıver, Mehmet; Bulut, Ahmet
The first photometric solution in the B , V ,Rc and Ic filters of the short period GW Psc eclipsing binary is presented based on new ground-based CCD photometric observations. We analysed the BVRI photometric light curves of the system, using Phoebe0.31a, a binary star modelling program, with the Wilson and Devinney (Wilson a…
Hunting for overlooked eccentric eclipsing binaries from ASAS-3 survey
Khalikova, A. V.; Gaynullina, E. R.; Serebryanskiy, A. V.
We present the results of searching for new candidates of eclipsing binaries with eccentric orbits in the ASAS Catalog of Variable Stars (ACVS) using publicly available data from the All Sky Automated Survey (ASAS) and the Transiting Exoplanet Survey Satellite (TESS). Unsupervised machine learning techniques were applied to find anomalies among th…
New light curve analysis and period changes of the HW Vir-type binary system V1828 Aql
Bulut, İ.; Nehir, Ç.
The new BVRI photometric observations of the HW Vir-type eclipsing binary system V1828 Aql (P = 0.11037399 days) were presented. From these measurements, 16 new eclipse times have been obtained. The light curves in BVRI colors and the radial curves were simultaneously analyzed by using the Wilson-Devinney method for the system parameters. The syst…
First photometric study of two eclipsing binary star systems: V523 And and V543 And
Erdem, Ahmet; Öztürk, Oğuz
Detailed photometric analysis of V523 And and V543 And from the Wide Angle Search for Planets survey is presented for the first time. It was found that while V523 And is a detached binary, V543 And is a semi-detached binary star system. The adopted masses and radii for the primary and secondary components are M1 = 0 . 77 ± 0 . 08 M⊙, R<…
Solar wind turbulence: Connections with energetic particles
Oughton, Sean; Engelbrecht, N. Eugene
For the solar wind, a wealth of observational evidence indicates that turbulence is an important dynamical process for velocity (v), magnetic (b), and other related fluctuations at MHD (fluid) scales. Here we review such observations and turbulence features, including discussion of when wave or turbulence descriptions can (or cannot) explain the o…