Zobrazeno 1 - 10
of 1 121
pro vyhledávání: '"Janik, J."'
Autor:
Krticka, J., Krtickova, I., Bidin, C. Moni, Kajan, M., Zaggia, S., Monaco, L., Janik, J., Mikulasek, Z., Paunzen, E.
A fraction of the extreme horizontal branch stars of globular clusters exhibit a periodic light variability that has been attributed to rotational modulation caused by surface spots. These spots are believed to be connected to inhomogeneous surface d
Externí odkaz:
http://arxiv.org/abs/2401.10626
We aim to understand the influence of evolutionary modified surface abundances on the strength of the stellar wind in the helium-dominated subdwarfs CD-46 8926 and CD-51 11879. We used our own optical spectroscopy combined with archival ultraviolet s
Externí odkaz:
http://arxiv.org/abs/2401.04288
Autor:
Krtička, J., Benáček, J., Budaj, J., Korčáková, D., Pál, A., Piecka, M., Zejda, M., Bakış, V., Brož, M., Chang, Hsiang-Kuang, Faltová, N., Gális, R., Jadlovský, D., Janík, J., Kára, J., Kolář, J., Krtičková, I., Kubát, J., Kubátová, B., Kurfürst, P., Labaj, M., Merc, J., Mikulášek, Z., Münz, F., Paunzen, E., Prišegen, M., Ramezani, T., Rievajová, T., Řípa, J., Schmidtobreick, L., Skarka, M., Szász, G., Weiss, W., Zajaček, M., Werner, N.
We outline the impact of a small two-band UV-photometry satellite mission on the field of stellar physics, magnetospheres of stars, binaries, stellar clusters, interstellar matter, and exoplanets. On specific examples of different types of stars and
Externí odkaz:
http://arxiv.org/abs/2306.15081
Autor:
Krticka, J., Kawka, A., Mikulasek, Z., Fossati, L., Krtickova, I., Prvak, M., Janik, J., Liptaj, R., Zejda, M., Paunzen, E.
Publikováno v:
A&A 674, A94 (2023)
Very precise satellite photometry has revealed a large number of variable stars whose variability is caused either by surface spots or by binarity. Detailed studies of such variables provide insights into the physics of these objects. We study the na
Externí odkaz:
http://arxiv.org/abs/2305.05270
Autor:
Mikulasek, Z., Semenko, E., Paunzen, E., Huemmerich, S., North, P. L., Bernhard, K., Krticka, J., Janik, J.
Publikováno v:
A&A 668, A159 (2022)
CP2 stars show periodic photometric, spectroscopic, and magnetic variations with the rotational period. They are generally slow rotators, with rotational periods exceeding half a day, except for the late B-type star HD 60431, which has an unusually s
Externí odkaz:
http://arxiv.org/abs/2209.12207
Autor:
Werner, N., Řípa, J., Münz, F., Hroch, F., Jelínek, M., Krtička, J., Zajaček, M., Topinka, M., Dániel, V., Gromeš, J., Václavík, J., Steiger, L., Lédl, V., Seginak, J., Benáček, J., Budaj, J., Faltová, N., Gális, R., Jadlovský, D., Janík, J., Kajan, M., Karas, V., Korčáková, D., Kosiba, M., Krtičková, I., Kubát, J., Kubátová, B., Kurfürst, P., Labaj, M., Mikulášek, Z., Pál, A., Paunzen, E., Piecka, M., Prišegen, M., Ramezani, T., Skarka, M., Szász, G., Thöne, C., Zejda, M.
We present a near-UV space telescope on a ~70kg micro-satellite with a moderately fast repointing capability and a near real-time alert communication system that has been proposed in response to a call for an ambitious Czech national mission. The mis
Externí odkaz:
http://arxiv.org/abs/2207.05485
Autor:
Valtonen, Mauri J., Dey, Lankeswar, Zola, S., Ciprini, S., Kidger, M., Pursimo, T., Gopakumar, A., Matsumoto, K., Sadakane, K., Caton, D. B., Nilsson, K., Komossa, S., Bagaglia, M., Baransky, A., Boumis, P., Boyd, D., Castro-Tirado, A. J., Debski, B., Drozdz, M., Pérez, A. Escartin, Fiorucci, M., Garcia, F., Gazeas, K., Ghosh, S., Godunova, V., Gomez, J. L., Gredel, R., Grupe, D., Haislip, J. B., Henning, T., Hurst, G., Janík, J., Kouprianov, V. V., Lehto, H., Liakos, A., Mathur, S., Mugrauer, M., Nogues, R. Naves, Nucciarelli, G., Ogloza, W., Ojha, D. K., Pajdosz-Śmierciak, U., Pascolini, S., Poyner, G., Reichart, D. E., Rizzi, N., Roncella, F., Sahu, D. K., Sillanpää, A., Simon, A., Siwak, M., Alfaro, F. C. Soldán, Sonbas, E., Tosti, G., Vasylenko, V., Webb, J. R., Zielinski, P.
OJ 287 is a BL Lacertae type quasar in which the active galactic nucleus (AGN) outshines the host galaxy by an order of magnitude. The only exception to this may be at minimum light when the AGN activity is so low that the host galaxy may make quite
Externí odkaz:
http://arxiv.org/abs/2205.15589
Autor:
Shafter, A. W., Hornoch, K., Benáček, J., Galád, A., Janík, J., Juryšek, J., Kotková, L., Kurfürst, P., Kučáková, H., Kušnirák, P., Liška, J., Paunzen, E., Skarka, M., Škoda, P., Wolf, M., Zasche, P., Zejda, M.
The results of the first synoptic survey of novae in the barred spiral and starburst galaxy, M83 (NGC 5236), are presented. A total of 19 novae and one background supernova were discovered during the course of a nearly seven-year survey comprised of
Externí odkaz:
http://arxiv.org/abs/2110.00676
Autor:
Kawka, Adela, Vennes, Stephane, Ferrario, Lilia, Bessell, M. S., Keller, S. C., Paunzen, E., Buckley, D. A. H., Groenewald, D., Janik, J., Zejda, M.
We report the discovery of a rare close binary system, SMSS J160639.78-100010.7, comprised of a magnetic white dwarf with a field of about 30 MG and a brown dwarf. We measured an orbital period of 92 min which is consistent with the photometric perio
Externí odkaz:
http://arxiv.org/abs/2107.13141
Autor:
Zasche, P., Wolf, M., Kučáková, H., Kára, J., Merc, J., Zejda, M., Skarka, M., Janík, J., Kurfürst, P.
Publikováno v:
2020A&A...640A..33Z
We present an extensive study of 162 early-type binary systems located in the LMC galaxy that show apsidal motion and have never been studied before. For the ample systems, we performed light curve and apsidal motion modelling for the first time. The
Externí odkaz:
http://arxiv.org/abs/2008.08362