Zobrazeno 1 - 10
of 94
pro vyhledávání: '"S. Stefl"'
Autor:
Juan Zorec, A. E. Tarasov, D. McDavid, S. Stefl, Eiji Kambe, M. Floquet, Nelson Vani Leister, A. M. Hubert, M. Hahula, Eduardo Janot-Pacheco, Ryuko Hirata, D. R. Gies
Publikováno v:
International Astronomical Union Colloquium. 175:550-553
The Be shell star EW Lac was observed in September 1993 during a multi-site campaign. Results from visual spectroscopy and polarimetry are summarized here. He I 6678 profiles have been compared to previous observations held in 1989 and show an additi
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 305:505-518
We analyse the periodic variability of the Be star 28 (ω) CMa. The data consist of 275 new He I 6678 line profiles of high spectral and temporal resolution, and new Stromgren and Geneva photometry. The photometric analysis has been extended by inclu
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 305:519-526
ABSTRA C T We analyse a series of high-resolution line profiles of He i 6678 in the periodic Be star 28 CMa. A simple zeroth-order approximation to the eigenfunctions is used to model the line profile variations in terms of non-radial pulsation. In a
Publikováno v:
Zdeněk Kopal’s Binary Star Legacy ISBN: 1402031319
oAnd is one of the most frequently observed Be stars, both in photometry and spectroscopy. It is a multiple system of at least four stars (a Be star, a close binary of spectral types B7 and B8, and an A star). For over a century, numerous observers r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0aede50d8ade155b44cf22efbe987cd1
https://doi.org/10.1007/1-4020-3875-5_22
https://doi.org/10.1007/1-4020-3875-5_22
Autor:
Julien Girard, I. Yegorova, W. J. de Wit, G. Carraro, S. Stefl, George Hau, G. Brammer, D. Nuernberger, D. Barria, M. Moerchen, Linda Schmidtobreick, A. Bayo, Th. Rivinius, M. Pretorius, Fernando Selman, H. M. J. Boffin, R. Sanchez-Janssen, Y. Momany, Valentin D. Ivanov, Yuri Beletsky
Publikováno v:
Proceedings of the International Astronomical Union. 7:404-405
The well-known recurrent nova T Pyx has brightened by 7 magnitudes, starting on 2011 April 14, its first eruption since 1966. T Pyx is unique amongst recurrent novæ in being surrounded by a nebula formed of material ejected during previous eruptions
Publikováno v:
Pulsation, Rotation and Mass Loss in Early-Type Stars ISBN: 9780792330455
The reality of the previously reported triple-wave light curve (Cuypers et al. 1989, A&A Suppl. 81, 151), and relations between rapid line profile and brightness variations of the B1-2III-Ve star η Cen (HD 127972) were investigated by means of simul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c96ae980e8fd593e0dce36935ed67755
https://doi.org/10.1007/978-94-011-1030-3_83
https://doi.org/10.1007/978-94-011-1030-3_83
Autor:
F. Žďárský, S. Stefl, S. Kříž, Hrvoje Božić, P. Harmanec, Pavel Koubský, Petr Hadrava, K. Juza, Krešimir Pavlovski, Ž. Ružić, J. Horn
Publikováno v:
Pulsation, Rotation and Mass Loss in Early-Type Stars ISBN: 9780792330455
Since their discovery (by Father Secchi in 1866) until the end of sixties, Be stars were not a subject of any systematic studies of their possible light and colour variations. Already at that time, the astronomical literature contained ample evidence
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f5e1bef4e39f8203546e54d8303c6c8
https://doi.org/10.1007/978-94-011-1030-3_80
https://doi.org/10.1007/978-94-011-1030-3_80
Publikováno v:
Pulsation, Rotation and Mass Loss in Early-Type Stars ISBN: 9780792330455
Many previous surveys of the rapid variability of Be stars (e.g., Balona et al. 1987, Cuypers et al. 1989, Balona et al 1992) were limited to the Stromgren b-band only. We have undertaken a new observational effort with the specific aim of studying c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cf0bf4e4f9a5e1e74fed777af8dc6729
https://doi.org/10.1007/978-94-011-1030-3_82
https://doi.org/10.1007/978-94-011-1030-3_82
Autor:
S. Stefl, E. J. Kennelly, M. Kato, Gordon A. H. Walker, H. Ando, Ryuko Hirata, A. E. Tarasov, E. Kambe
Publikováno v:
International Astronomical Union Colloquium. 155:301-302
Two large sinusoidal variations with periods of 3.337 hrs and 2.018 hrs and other smaller variations have been detected from the period analysis of Hel Λ 6678 spectra obtained by our multi-site campaign for ζ Oph in May, 1993. The resultant periodg
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