Search Publications
Photometric study of the overcontact binary V826 Aur
Tobin, R. Wes; Berrington, Robert C.
We present BVRC differential photometry of an eclipsing binary system V826 Aur. A period analysis shows near constant period of 0.36 days across two decades of observation. The best fit models are consistent with a W-type W UMa overcontact binary consisting of a less massive G8 primary star and a more massive K0 secondary star. The mode…
The first photometric and spectroscopic analysis of the neglected totally eclipsing contact binary NSVS 2536063
Wang, Xi; Li, Kai; Xia, Qi-Qi +4 more
We firstly studied the neglected totally eclipsing contact binary NSVS 2536063 using the newly observed g'r'i' light curves of 60 cm Ningbo Bureau of Education and Xinjiang Observatory Telescope (NEXT) and some public data, which come from the Transiting Exoplanet Survey Satellite (TESS), the All-Sky Automated Surv…
Wray 15-811: An unusual runaway star
Gamen, R.; Di Mille, F.; Gramajo, L. +4 more
We investigate Wray 15-811, a poorly studied object of controversial nature. We present for the first time spectroscopic observations (at low, medium, and high resolution), together with deep narrow-band images. These original data are combined with data from public surveys, to infer the nature of this object.
We conclude that Wray 15-811 is …New variable sources revealed by DECam toward the LMC: The first 15 deg2
Nucita, A. A.; De Paolis, F.; Franco, A. +2 more
The Dark Energy Camera (DECam) is a sensitive, wide field instrument mounted at the prime focus of the 4 mV. Blanco Telescope in Chile. Beside its main objectives, i.e. understanding the growth and evolution of structures in the Universe, the camera offers the opportunity to observe a ∼ 3deg2 field of view in one single pointing and, wi…
Analysis of the B-stars in field of the solar neighborhood young open cluster IC 2391 using UVES spectra and Gaia DR3
Hendy, Y. H. M.; El-Depsey, M. H.; Shokry, Ahmed +2 more
In this paper, we present the stellar parameters of individual B-type stars in the IC 2391 young open cluster, using the Barbier-Chalonge-Divan (BCD) Spectrophotometry System, to obtain stellar fundamental parameters from direct measurements of the Balmer discontinuity. This method is optimally suited for late B-stars to determine stellar fundamen…
First photometric study of three eclipsing binary star systems: V495 Aur, V589 Aur and V478 Cam
Erdem, Ahmet; Öztürk, Oğuz
The light curve solutions and orbital period analysis of V495 Aur, V589 Aur and V478 Cam eclipsing binary star systems are presented for the first time in this study. Transiting Exoplanet Survey Satellite (TESS) observations were used as observational data. From the light curve solutions, it was concluded that all three systems are semi-detached b…
X-ray and optical observations of two AM Her type cataclysmic variables: V388 Peg and V1189 Her
Zengi̇n Çamurdan, Dicle
We present time-resolved photometry of a polar V388 Peg and a strong candidate polar V1189 Her observed by T100 telescope at TÜBİTAK National Observatory between June-August 2014 and their X-ray observations using Swift archival data obtained in Apr 2014 (V388 Peg) and in Nov 2011 (V1189 Her). These data were supplemented by archival CRTS, ZTF, AS…
Possible merger signatures of the bulges of non-dwarf galaxies in the core of the Coma Cluster
Hasan, S. N.; Poloji, Nagamani; Hasan, Priya
In this paper, we discuss a method to study virialised clusters of galaxies with no-interaction features, like tails and bridges, using diagnostics of bulge classification and their properties, namely Sérsic index (n) and the Kormendy relation. We study a sample of non-dwarf galaxies in the core of the Coma Cluster using HST/ACS data. We divided o…
Study of five eccentric eclipsing binary systems
Zejda, M.; Auer, R. F.; Kolář, J.
In this paper we present the comprehensive analysis of five binary systems: GX Lac, TT Lyr, OGLE LMC-ECL-7641, OGLE LMC-ECL-17660, and OGLE LMC-ECL-17411. With new photometric observations combined with other available data mostly from TESS, MACHO, and OGLE, we calculated new minima timings and study the O - C diagrams. We fitted the light curves …