Zobrazeno 1 - 10
of 165
pro vyhledávání: '"Latev G."'
Autor:
Zamanov R., Stoyanov K.A., Latev G., Marti J., Takey A., Elhosseiny E.G., Christova M.D., Minev M., Vujčić V., Moyseev M., Marchev V.
Publikováno v:
Serbian Astronomical Journal, Vol 2024, Iss 208, Pp 41-46 (2024)
We performed optical photometry and spectral observations of the symbiotic stars 4U1954+319 and ZZ CMi. For 4U1954+319, using high-resolution spectra, we, measure the equivalent widths of diffuse interstellar bands (DIBs) and estimate the interstella
Externí odkaz:
https://doaj.org/article/c05d390d79ed4d7f8aadeb1f1b977d9a
Autor:
Zamanov, R., Stoyanov, K. A., Latev, G., Marti, J., Takey, A., Elhosseiny, E. G., Christova, M. D., Minev, M., Vujcic, V., Moyseev, M., Marchev, V.
We performed optical photometry and spectral observations of the symbiotic stars 4U1954+319 and ZZ CMi. For 4U1954+319 using high-resolution spectra we measure the equivalent widths of diffuse interstellar bands and estimate the interstellar reddenin
Externí odkaz:
http://arxiv.org/abs/2402.14378
Autor:
Zamanov, R., Boeva, S., Latev, G. Y., Semkov, E., Minev, M., Kostov, A., Bode, M. F., Marchev, V., Marchev, D.
Context: T CrB (NOVA CrB 1946) is a famous recurrent nova with a recurrence timescale of 80 years. Aims: We aim to estimate the colours, luminosity, and mass-accretion rate for T CrB (NOVA CrB 1946) during and after the superactive state. Methods and
Externí odkaz:
http://arxiv.org/abs/2312.04342
Publikováno v:
Bulgarian Journal of Physics, vol. 51, 263-267 (2024)
Pre-outburst signal (a decrease of the optical brightness) just before the outburst is clearly detected in the observations of the T CrB obtained before and during the 1946 outburst. A similar decrease is also visible in the light curve of RS Oph dur
Externí odkaz:
http://arxiv.org/abs/2308.04104
We present a detailed photometric study of the bright cataclysmic variable BG Tri using ground-based observations mainly from Rozhen Observatory, ASAS-SN, TESS, and WASP sky surveys. We report the discovery of a negative superhump with P$_{-sh}$ = 0.
Externí odkaz:
http://arxiv.org/abs/2208.10855
Autor:
Zamanov, R. K., Kostov, A., Moyseev, M., Petrov, N., Nikolov, Y. M., Latev, G. Y., Marchev, D., Boeva, S., Stoyanov, K. A., Minev, M. S., Marti, J., Radeva, V., Sanchez-Ayaso, E., Bode, M. F., Ilkiewicz, K., Nikolov, G., Luque-Escamilla, P. L., Spassov, B., Borisov, B., Marchev, V. D., Kurtenkov, A.
We report photometric observations of the hidden symbiotic star SU Lyn in the optical bands. In five nights we detect a weak flickering in U band with amplitude of about 0.05 magnitudes. No intranight variations are found in B, V, g' and r' bands. Th
Externí odkaz:
http://arxiv.org/abs/2206.10151
Autor:
Zamanov, R. K., Stoyanov, K. A., Marchev, D., Tomov, N. A., Wolter, U., Bode, M. F., Nikolov, Y. M., Stefanov, S. Y., Kurtenkov, A., Latev, G. Y.
We present new spectroscopic observations of the Be/black hole binary MWC 656 obtained during the period 2015 - 2021. We measure the equivalent width of H$\alpha$ (EW$_\alpha$), H$\beta$ ($EW_\beta$), and the distance between the peaks of H$\alpha$ (
Externí odkaz:
http://arxiv.org/abs/2206.06013
Autor:
Zamanov, R. K., Stoyanov, K. A., Kostov, A., Kurtenkov, A., Nikolov, G., Latev, G., Bode, M. F., Marti, J., Luque-Escamilla, P. L., Tomov, N., Nikolov, Y. M., Boeva, S. S.
We present photometric and spectral observations of the symbiotic star ZZ CMi. We detect intranight variability - flickering and smooth variations in U band. The amplitude of the flickering is about 0.10-0.20 mag in U band. In the B band the variabil
Externí odkaz:
http://arxiv.org/abs/2103.06625
Autor:
Stoyanov, K. A., Iłkiewicz, K., Luna, G. J. M., Mikołajewska, J., Mukai, K., Martí, J., Latev, G., Boeva, S., Zamanov, R. K.
We performed high-resolution optical spectroscopy and X-ray observations of the recently identified Mira-type symbiotic star EF Aql. Based on high-resolution optical spectroscopy obtained with SALT, we determine the temperature ($\sim $55 000 K) and
Externí odkaz:
http://arxiv.org/abs/2005.03379
Autor:
Zamanov, R. K., Boeva, S., Stoyanov, K. A., Latev, G., Spassov, B., Kurtenkov, A., Nikolov, G.
We analyse optical photometric data of short term variability (flickering) of the accreting white dwarf in the jet-ejecting symbiotic star MWC560. The observations are obtained in 17 nights during the period November 2011 - October 2019. The colour-m
Externí odkaz:
http://arxiv.org/abs/2004.00511