Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Kurtenkov, Alexander"'
Autor:
Bachev, Rumen, Tripathi, Tushar, Gupta, Alok C., Kushwaha, Pankaj, Strigachev, Anton, Kurtenkov, Alexander, Nikolov, Yanko, Boeva, Svetlana, Damljanovic, Goran, Vince, Oliver, Stojanovic, Milan, Kishore, Shubham, Gaur, Haritma, Dhiman, Vinit, Fan, Junhui, Kalita, Nibedita, Spassov, Borislav, Semkov, Evgeni
In this work, we report the presence of rapid intra-night optical variations in both -- flux and polarization of the blazar BL Lacertae during its unprecedented 2020--2021 high state of brightness. The object showed significant flux variability and s
Externí odkaz:
http://arxiv.org/abs/2304.03975
Autor:
Georgiev, Stefan, Konstantinova-Antova, Renada, Borisova, Ana, Kolev, Dimitar, Aurière, Michel, Petit, Pascal, Belcheva, Maya, Markov, Haralambi, Bogdanovski, Rumen, Spassov, Borislav, Zamanov, Radoslav, Tomov, Nikolay, Kurtenkov, Alexander
Publikováno v:
AIP Conference Proceedings, Volume 2075, Issue 1, id.090003
We present a spectral study of the single magnetically active K giant OP And in the period 1979 -- 2018, monitoring the variability of the activity indicator line H${\alpha}$. Original data obtained in the period 2015 -- 2018 with the echelle spectro
Externí odkaz:
http://arxiv.org/abs/2202.00925
Autor:
Kurtenkov, Alexander
Possible M-type contact binaries were investigated by selecting W UMa-type variables with orbital periods below the 0.22-day cutoff. Gaia parallaxes were combined with Gaia and 2MASS photometry to obtain G and J-band absolute magnitudes of 674 red va
Externí odkaz:
http://arxiv.org/abs/2201.10637
Autor:
Kurtenkov, Alexander, Napetova, Mirela
Data from the VSX, SDSS DR12, and Gaia DR2 catalogs were combined in order to explore the observed temperature distribution of known contact binaries. Color-temperature relations were applied to calculate the effective temperatures of approximately 2
Externí odkaz:
http://arxiv.org/abs/1902.10691
Autor:
Bose, Subhash, Dong, Subo, Pastorello, A., Filippenko, Alexei V., Kochanek, C. S., Mauerhan, Jon, Romero-Canizales, C., Brink, Thomas, Chen, Ping, Prieto, J. L., Post, R., Ashall, Christopher, Grupe, Dirk, Tomasella, L., Benetti, Stefano, Shappee, B. J., Stanek, K. Z., Cai, Zheng, Falco, E., Lundqvist, Peter, Mattila, Seppo, Mutel, Robert, Ochner, Paolo, Pooley, David, Stritzinger, M. D., Villanueva Jr., S., Zheng, WeiKang, Beswick, R. J., Brown, Peter J., Cappellaro, E., Davis, Scott, Fraser, Morgan, de Jaeger, Thomas, Elias-Rosa, N., Gall, C., Gaudi, B. Scott, Herczeg, Gregory J., Hestenes, Julia, Holoien, T. W. -S., Hosseinzadeh, Griffin, Hsiao, E. Y., Hu, Shaoming, Jaejin, Shin, Jeffers, Ben, Koff, R. A., Kumar, Sahana, Kurtenkov, Alexander, Lau, Marie Wingyee, Prentice, Simon, Reynolds, T., Rudy, Richard J., Shahbandeh, Melissa, Somero, Auni, Stassun, Keivan G., Thompson, T. A., Valenti, Stefano, Woo, Jong-Hak, Yunus, Sameen
Hydrogen-poor superluminous supernovae (SLSNe-I) have been predominantly found in low-metallicity, star-forming dwarf galaxies. Here we identify Gaia17biu/SN 2017egm as an SLSN-I occurring in a "normal" spiral galaxy (NGC 3191) in terms of stellar ma
Externí odkaz:
http://arxiv.org/abs/1708.00864
Autor:
Kurtenkov, Alexander
The only well-studied red nova progenitor (V1309 Sco) was a contact binary with a 1.4-day period. The prospects for searching for similar systems, as well as stellar merger candidates in general, are explored in this work. The photospheric temperatur
Externí odkaz:
http://arxiv.org/abs/1609.06595
Publikováno v:
Research in Astronomy and Astrophysics, 16, 105 (2016)
The proper motions of 15 nearby (d < 1 kpc) open clusters were recalculated using data from the UCAC4 catalog. Only evolved or main sequence stars inside a certain radius from the center of the cluster were used. The results differ significantly from
Externí odkaz:
http://arxiv.org/abs/1603.01767
Autor:
Kurtenkov, Alexander
Publikováno v:
Обучение по природни науки и върхови технологии / Natural Science and Advanced Technology Education. 30(4):413-425
Externí odkaz:
https://www.ceeol.com/search/article-detail?id=977509
Autor:
Kurtenkov, Alexander, Pessev, Peter, Tomov, Toma, Barsukova, Elena A., Fabrika, Sergei, Vida, Krisztián, Hornoch, Kamil, Ovcharov, Evgeni P., Goranskij, Vitaly P., Valeev, Azamat F., Molnár, László, Sárneczky, Krisztián, Kostov, Andon, Nedialkov, Petko, Valenti, Stefano, Geier, Stefan, Wiersema, Klaas, Henze, Martin, Shafter, Allen W., Dimitrova, Rosa Victoria Muñoz, Popov, Vasil N., Stritzinger, Maximilian
Publikováno v:
A&A 578, L10 (2015)
M31N 2015-01a (or M31LRN 2015) is a red nova that erupted in January 2015 -- the first event of this kind observed in M31 since 1988. Very few similar events have been confirmed as of 2015. Most of them are considered to be products of stellar merger
Externí odkaz:
http://arxiv.org/abs/1505.07808
Autor:
Bachev, Rumen, Tripathi, Tushar, Gupta, Alok C, Kushwaha, Pankaj, Strigachev, Anton, Kurtenkov, Alexander, Nikolov, Yanko, Boeva, Svetlana, Damljanovic, Goran, Vince, Oliver, Stojanovic, Milan, Kishore, Shubham, Gaur, Haritma, Dhiman, Vinit, Fan, Junhui, Kalita, Nibedita, Spassov, Borislav, Semkov, Evgeni
Publikováno v:
Monthly Notices of the Royal Astronomical Society; Jun2023, Vol. 522 Issue 2, p3018-3035, 18p