Search Publications
Detailed analysis of an eccentric TESS binary star with solar-type components: TIC 284613090
Aliçavuş, Fahri
Eclipsing binary stars are significant objects for understanding stellar evolution, stellar population synthesis, and galaxy dynamics. Thanks to the increasing number of high-quality photometric data of space observations, the sensitivity of the fundamental astrophysical parameters (mass M, radius R) has risen and this situation has highlighted th…
Interstellar polarization and extinction toward the Recurrent Nova T CrB
Nikolov, Yanko
Spectropolarimetry is a powerful tool for diagnostic of interstellar matter and gives information about the geometry of the ejected material after the novae outbursts. In this paper are presented spectropolarimetric observations of the recurrent nova T CrB at quiescence obtained with FoReRo2 attached to the Cassegrain focus of the 2.0 m RCC telesc…
The overcontact binary SS arietis
Nelson, Robert H.
New radial velocity and photometric data for SS Ari have been obtained and analysed using the 2003 versions of the Wilson-Devinney code. Values for fundamental quantities have been obtained: M1 = 0.510 (15) M⊙, M2 = 1.521 (26) M⊙, R1 = 0.87 (2) R⊙, R2 = 1.42 (2) R⊙
The two eccentric eclipsing binaries in multiple systems: V539 Arae and V335 Serpentis
Wolf, M.; Zejda, M.; Mašek, M. +4 more
We present new results of our long-term observational project to analyze the variations of the orbital period for early-type eccentric eclipsing binaries. Altogether 77 new mid-eclipse times were measured or derived for two eclipsing binaries, namely V539 Ara and V335 Ser. Based on current O - C diagrams, we found in both systems that times of min…
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…