Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Roberto F. Viotti"'
Autor:
Olga Maryeva, Roberto F. Viotti, Gloria Koenigsberger, Massimo Calabresi, Corinne Rossi, Roberto Gualandi
Publikováno v:
Galaxies, Vol 7, Iss 3, p 79 (2019)
GR 290 (M 33 V0532 = Romano’s Star) is a unique variable star in the M33 galaxy, which simultaneously displays variability typical for luminous blue variable (LBV) stars and physical parameters typical for nitrogen-rich Wolf-Rayet (WR) stars (WN).
Externí odkaz:
https://doaj.org/article/1ede6b764bc142d6862deba4744094d8
Autor:
Roberto F. Viotti, Oleg V. Egorov, Corinne Rossi, O. V. Maryeva, T. A. Lozinskaya, Gloria Koenigsberger, Massimo Calabresi, Sergey Karpov
Publikováno v:
Astronomy & Astrophysics
Context: GR290 (M33 V0532=Romano's star) is a luminous M33 object undergoing photometric variability typical for luminous blue variable (LBV) stars. It lies inside Wolf-Rayet region in the Hertzsprung-Russell diagram and possesses a WN8 type spectrum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f1768768fe281fc8ce6bb6f9167c69e0
Autor:
E. L. Chentsov, Richard O. Gray, Karen S. Bjorkman, Richard C. Puetter, L. Norci, R. J. Rudy, S. M. Mazuk, G. Klingenberg, David K. Lynch, R. B. Perry, S. Kildahl, Anatoly S. Miroshnichenko, K. N. Grankin, T. L. Gandet, Alex C. Carciofi, Valentina G. Klochkova, V. F. Polcaro, S. Bernabei, A. V. Kusakin, Catherine C. Venturini, Sergey Zharikov, Roberto F. Viotti
Publikováno v:
The Astrophysical Journal. 700:209-220
FS CMa type stars are a group of Galactic objects with the B[e] phenomenon. They exhibit strong emission-line spectra and infrared excesses, which are most likely due to recently formed circumstellar dust. The group content and identification criteri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::878456a43a95031392c94188b6e9b610
https://doi.org/10.1088/0004-637x/700/1/209
https://doi.org/10.1088/0004-637x/700/1/209
Autor:
Roberto F. Viotti, Rosario González-Riestra, Takashi Iijima, Stefano Bernabei, Riccardo Claudi, Jochen Greiner, Michael Friedjung, Vito Francesco Polcaro, Corinne Rossi
Publikováno v:
Zdeněk Kopal’s Binary Star Legacy ISBN: 1402031319
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::12a9cb22afdc4daad2db33bdc77fcf82
https://doi.org/10.1007/1-4020-3875-5_63
https://doi.org/10.1007/1-4020-3875-5_63
Autor:
L. Norci, Luis J. Corral, Philippe R.J. Eenens, Roberto F. Viotti, V. Francesco Polcaro, Corinne Rossi
Publikováno v:
Symposium - International Astronomical Union. 212:224-225
We present preliminary results concerning the O4If+ star HD 15570. Of-type supergiants are believed to represent an evolved evolutionary stage of very high mass stars (Minit > 40 M⊙). Their low numbers and extreme peculiarity make each of these obj
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::de37e2cbc08b465720b21ab9b12cf7e5
https://doi.org/10.1017/s0074180900212138
https://doi.org/10.1017/s0074180900212138
Publikováno v:
Symposium - International Astronomical Union. 212:566-567
Median values of the fwhm and equivalent width Wλ of the C iv 581 nm, O v 559 nm and 465 nm emission lines were derived from an extended statistical analysis of WC and WO stars (Norci et al. 2002; see Table 1). We find that the C iv equivalent width
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c8fc2886fcf614f95709b7c171c966bc
https://doi.org/10.1017/s0074180900212886
https://doi.org/10.1017/s0074180900212886
Publikováno v:
Symposium - International Astronomical Union. 193:88-89
The Wolf-Rayet WO spectral sequence was introduced by Barlow & Hummer (1982) for four Pop I WR stars with very strong O VI 381 nm doublet emission. At the time, the evolution of very massive stars was poorly known, and their classification was based
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c235a8b50dd5e3007e6164c475e66f45
https://doi.org/10.1017/s0074180900205081
https://doi.org/10.1017/s0074180900205081
Autor:
Roberto F. Viotti
Publikováno v:
Highlights of Astronomy. 13:972-972
We describe our project for a small and compact telescope, based on the TRT design, for wide-field observations from Dome C on the Antarctic Plateau, and discuss the main scientific goals.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e85f2ecba6b0a6b9fde8bd9015810a6
https://doi.org/10.1017/s1539299600017883
https://doi.org/10.1017/s1539299600017883
Autor:
Roberto F. Viotti
Publikováno v:
Highlights of Astronomy. 9:727-728
Spectroscopy is a fundamental tool for the investigation of physical conditions in astronomical objects. Up to the present a considerable amount of information has been collected, which could be of great help in research in all fields of Astrophysics
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b1787653345428a1aef112586ea24fee
https://doi.org/10.1017/s1539299600010194
https://doi.org/10.1017/s1539299600010194
Autor:
Corinne Rossi, Roberto F. Viotti, Roberto Gualandi, Massimo Calabresi, Gloria Koenigsberger, O. V. Maryeva
Publikováno v:
Galaxies, Vol 7, Iss 3, p 79 (2019)
Galaxies
Galaxies
GR 290 (M 33 V0532 = Romano's Star) is a unique variable star in the M33 galaxy, which simultaneously displays variability typical for luminous blue variable (LBV) stars and physical parameters typical for nitrogen-rich Wolf-Rayet (WR) stars (WN). As
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6273b711f089bf53aa9145aa269c1d6a