Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Djurasevic, Gojko"'
Autor:
Wadhwa, Surjit S., Landin, Natalia R., Arbutina, Bojan, Tothill, Nicholas F. H., De Horta, Ain Y., Filipovic, Miroslav D., Petrovic, Jelena, Djurasevic, Gojko
With the ever-increasing number of light curve solutions of contact binary systems increasing number of potential bright red nova progenitors are being reported. There remains, however, only one confirmed event. In the present study we undertake a co
Externí odkaz:
http://arxiv.org/abs/2411.02020
Autor:
Wadhwa, Surjit S., Petrovic, Jelena, Tothill, Nick F. H., De Horta, Ain Y., Filipovic, Miroslav D., Djuraševic, Gojko
The study reports photometric and spectroscopic observations of two recently recognised contact binary systems. Both systems show total eclipses and analysis of the light curves indicate both have a very low mass ratios of less than 0.3. We derive ab
Externí odkaz:
http://arxiv.org/abs/2308.11906
Autor:
Wadhwa, Surjit S., Arbutina, Bojan, Tothill, Nick F. H., Filipovic, Miroslav D., De Horta, Ain Y., Petrovic, Jelena, Djurasevic, Gojko
Photometric observations and analysis of twelve previously poorly studied contact binary systems is presented. All show total eclipses and have extremely low mass ratios ranging from 0.072 to 0.15. Also, all show characteristics of orbital instabilit
Externí odkaz:
http://arxiv.org/abs/2306.15190
Autor:
Wadhwa, Surjit S., De Horta, Ain Y., Filipovic, Miroslav D., Tothill, Nick F. H., Arbutina, Bojan, Petrovic, Jelena, Djurasevic, Gojko
The study presents a simplified method to identify potential bright red nova progenitors based on the amplitude of the light curve and infrared (J-H) colour of a contact binary system. We employ published criteria for contact binary orbital instabili
Externí odkaz:
http://arxiv.org/abs/2208.00626
Autor:
Wadhwa, Surjit S., De Horta, Ain, Filipovic, Miroslav D., Tothill, N. F. H., Arbutina, Bojan, Petrovic, Jelena, Djurasevic, Gojko
We present photometric analysis of three bright red nova progenitor contact binary systems: ASAS J082151-0612.6, TYC 7281-269-1 and TYC 7275-1968-1. The primary components in all three systems are solar-type low mass stars with radii somewhat larger
Externí odkaz:
http://arxiv.org/abs/2208.00362
Autor:
Mennickent, Ronald, Djurašević, Gojko
Publikováno v:
A&A 653, A89 (2021)
Some close binaries of the beta Lyrae type show photometric cycles longer than the orbital one, which are possibly related to changes in their accretion disks. We aim to understand the short- and long-scale changes observed in the light curve of the
Externí odkaz:
http://arxiv.org/abs/2107.08144
Autor:
Wadhwa, Surjit S., De Horta, Ain, Filipović, Miroslav D., Tothill, N. F. H., Arbutina, Bojan, Petrović, Jelena, Djurašević, Gojko
Publikováno v:
2021MNRAS.501..229W
ZZ PsA is a neglected bright southern contact binary system with maximum V magnitude of 9.26. We present the first multi-band photometric analysis and find the system to be in deep contact (>95%) with an extremely low mass ratio of 0.078. The primary
Externí odkaz:
http://arxiv.org/abs/2011.09090
Autor:
Latković, Olivera, Cséki, Attila, Djurašević, Gojko, Essam, Ahmed, Hamed, Amal S., Youssef, Shahenaz M.
Publikováno v:
The Astronomical Journal, 2019, 157, 3
We observed the post-common-envelope eclipsing binary with a white dwarf component, QS Vir, using the 1.88 m telescope of Kotammia Observatory in Egypt. The new observations were analyzed together with all multicolor light curves available online (sa
Externí odkaz:
http://arxiv.org/abs/1901.01925
Autor:
Garrido, Hernán, Mennickent, Ronald E., Djuraŝevic, Gojko, Kołaczkowski, Zbigniew, Niemzcura, Ewa, Mennekens, Nicki
We analyze multicolor light curves and high resolution optical spectroscopy of the eclipsing binary and Double Periodic Variable OGLE 05155332-6925581. According to Mennickent et al., this system shows a significant change in the long non-orbital pho
Externí odkaz:
http://arxiv.org/abs/1210.1227
Autor:
Mennickent, Ronald, Kolaczkowski, Zbigniew, Djurasevic, Gojko, Michalska, Gabriela, Barria, Daniela
We give a brief report on spectroscopic properties of V 393 Scorpii. H alfa emission and shape and radial velocity of He I 5875 are modulated with the long cycle. The long cycle is explained as a relaxation cycle in the circumprimary disc, that cumul
Externí odkaz:
http://arxiv.org/abs/0911.0691