Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Prvak, M."'
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
Classical main-sequence chemically peculiar stars show light variability that originates in surface abundance spots. In the spots, the flux redistribution due to line (bound-bound) and bound-free transitions is modulated by stellar rotation and leads
Externí odkaz:
http://arxiv.org/abs/2104.04117
Autor:
Krticka, J., Kawka, A., Mikulasek, Z., Fossati, L., Krtickova, I., Prvak, M., Janik, J., Skarka, M., Liptaj, R.
Publikováno v:
A&A 639, A8 (2020)
Ultraprecise space photometry enables us to reveal light variability even in stars that were previously deemed constant. A large group of such stars show variations that may be rotationally modulated. This type of light variability is of special inte
Externí odkaz:
http://arxiv.org/abs/2005.12358
Helium-peculiar magnetic chemically peculiar stars show variations of helium abundance across their surfaces. As a result of associated atmospheric scale height variations, the stellar surface becomes distorted, with helium-rich regions dented inward
Externí odkaz:
http://arxiv.org/abs/2002.01385
Autor:
Krticka, J., Mikulasek, Z., Henry, G. W., Janik, J., Kochukhov, O., Pigulski, A., Leto, P., Trigilio, C., Krtickova, I., Luftinger, T., Prvak, M., Tichy, A.
Publikováno v:
A&A 625, A34 (2019)
CU Vir has been the first main sequence star that showed regular radio pulses that persist for decades, resembling the radio lighthouse of pulsars and interpreted as auroral radio emission similar to that found in planets. The star belongs to a rare
Externí odkaz:
http://arxiv.org/abs/1903.07331
Autor:
Reindl, Nicole, Bainbridge, M., Przybilla, N., Geier, S., Prvák, M., Krtička, J., Østensen, R. H., Telting, J., Werner, K.
Publikováno v:
2019, MNRAS Letters, 482, L93
The presence of ultra-high excitation (UHE) absorption lines (e.g., O VIII) in the optical spectra of several of the hottest white dwarfs poses a decades-long mystery and is something that has never been observed in any other astrophysical object. Th
Externí odkaz:
http://arxiv.org/abs/1811.02922
Autor:
Oksala, M. E., Kochukhov, O., Krticka, J., Townsend, R. H. D., Wade, G. A., Prvak, M., Mikulasek, Z., Silvester, J., Owocki, S. P.
The initial success of the Rigidly Rotating Magnetosphere (RRM) model application to the B2Vp star sigma OriE by Townsend, Owocki & Groote (2005) triggered a renewed era of observational monitoring of this archetypal object. We utilize high-resolutio
Externí odkaz:
http://arxiv.org/abs/1505.04839
Sigma Ori E (HD 37479) is the prototypical helium-strong star shown to harbor a strong magnetic field, as well as a magnetosphere consisting of two clouds of plasma. The observed optical (ubvy) light curve of sigma Ori E is dominated by eclipse featu
Externí odkaz:
http://arxiv.org/abs/1408.0627
The light variability of hot magnetic chemically peculiar stars is typically caused by the flux redistribution in spots with peculiar abundance. This raises the question why some stars with surface abundance spots show significant rotational light va
Externí odkaz:
http://arxiv.org/abs/1306.2458
Autor:
Krticka, J., Huang, L., Jagelka, M., Lüftinger, T., Mikulasek, Z., Niemczura, E., Prvak, M., Silvester, James, Wade, G.
Magnetic stars show several types of light variability which is modulated by the stellar rotation. In chemically peculiar stars, the redistribution of the flux in the surface regions with peculiar chemical composition leads to the light variability w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::5883926673d5365a6cc70a162ff140ea
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-357774
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-357774