Zobrazeno 1 - 10
of 325
pro vyhledávání: '"Viotti R"'
Autor:
Polcaro, V. F., Maryeva, O., Nesci, R., Calabresi, M., Chieffi, A., Galleti, S., Gualandi, R., Haver, R., Mills, O. F., Osborn, W. H., Pasquali, A., Rossi, C., Vasilyeva, T., Viotti, R. F.
We have built the historical light curve of the luminous variable GR 290 back to 1901, from old observations of the star found in several archival plates of M 33. These old recordings together with published and new data show that for at least half a
Externí odkaz:
http://arxiv.org/abs/1603.07284
Autor:
Sabatini, S., Tavani, M., Pian, E., Bulgarelli, A., Caraveo, P., Viotti, R., Corcoran, M. F., Giuliani, A., Pittori, C., Verrecchia, F., Vercellone, S., Mereghetti, S., Argan, A., Barbiellini, G., Boffelli, F., Cattaneo, P. W., Chen, A. W., Cocco, V., D'Ammando, F., Costa, E., De Paris, G., Del Monte, E., Di Cocco, G., Donnarumma, I., Evangelista, Y., Ferrari, A., Feroci, M., Fiorini, M., Froysland, T., Fuschino, F., Galli, M., Gianotti, F., Labanti, C., Lapshov, I., Lazzarotto, F., Lipari, P., Longo, F., Marisaldi, M., Mastropietro, M., Morelli, E., Moretti, E., Morselli, A., Pacciani, L., Pellizzoni, A., Perotti, F., Piano, G., Picozza, P., Pilia, M., Porrovecchio, G., Pucella, G., Prest, M., Rapisarda, M., Rappoldi, A., Rubini, A., Soffitta, P., Trifoglio, M., Trois, A., Vallazza, E., Vittorini, V., Zambra, A., Zanello, D., Santolamazza, P., Giommi, P., Colafrancesco, S., Antonelli, L. A., Salotti, L.
Publikováno v:
Nuclear Instrument & Methods A 630 (2011) 193-197
During its first 2 years of operation, the gamma-ray AGILE satellite accumulated an extensive dataset for the Galactic plane. The data have been monitored for transient sources and several gamma-ray sources were detected. Their variability and possib
Externí odkaz:
http://arxiv.org/abs/1202.0444
We study the long term, S Dor-type variability and the present hot phase of the LBV star GR290 (Romano's Star) in M33 in order to investigate possible links between the LBV and WNL stages of very massive stars. We use intermediate resolution spectra,
Externí odkaz:
http://arxiv.org/abs/1010.2136
AG Draconis produces a strong supersoft X-ray emission.The X-ray and optical/UV fluxes are in a strict anticorrelation throughout the active and quiescent phases. The aim of this contribution is to identify the source of the X-ray emission and reveal
Externí odkaz:
http://arxiv.org/abs/0908.1624
Autor:
Miroshnichenko, A. S., Chentsov, E. L., Klochkova, V. G., Zharikov, S. V., Grankin, K. N., Kusakin, A. V., Gandet, T. L., Klingenberg, G., Kildahl, S., Rudy, R. J., Lynch, D. K., Venturini, C. C., Mazuk, S., Puetter, R. C., Perry, R. B., Carciofi, A. C., Bjorkman, K. S., Gray, R. O., Bernabei, S., Polcaro, V. F., Viotti, R. F., Norci, L.
Publikováno v:
Astrophys.J.700:209-220,2009
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:
http://arxiv.org/abs/0906.0722
Autor:
Tavani, M., Sabatini, S., Pian, E., Bulgarelli, A., Caraveo, P., Viotti, R. F., Corcoran, M. F., Giuliani, A., Pittori, C., Verrecchia, F., Vercellone, S., Mereghetti, S., Argan, A., Barbiellini, G., Boffelli, F., Cattaneo, P. W., Chen, A. W., Cocco, V., D'Ammando, F., Costa, E., De Paris, G., Del Monte, E., Di Cocco, G., Donnarumma, I., Evangelista, Y., Ferrari, A., Feroci, M., Fiorini, M., Froysland, T., Fuschino, F., Galli, M., Gianotti, F., Labanti, C., Lapshov, I., Lazzarotto, F., Lipari, P., Longo, F., Marisaldi, M., Mastropietro, M., Morelli, E., Moretti, E., Morselli, A., Pacciani, L., Pellizzoni, A., Perotti, F., Piano, G., Picozza, P., Pilia, M., Porrovecchio, G., Pucella, G., Prest, M., Rapisarda, M., Rappoldi, A., Rubini, A., Soffitta, P., Trifoglio, M., Trois, A., Vallazza, E., Vittorini, V., Zambra, A., Zanello, D., Santolamazza, P., Giommi, P., Colafrancesco, S., Antonelli, L. A., Salotti, L.
Publikováno v:
Astrophys.J.698:L142-L146,2009
We present the results of extensive observations by the gamma-ray AGILE satellite of the Galactic region hosting the Carina nebula and the remarkable colliding wind binary Eta Carinae (Eta Car) during the period 2007 July to 2009 January. We detect a
Externí odkaz:
http://arxiv.org/abs/0904.2736
Understanding the nature of the instabilities of LBVs is important to understand the late evolutionary stages of very massive stars. We investigate the long term, S Dor-type variability of the luminous blue variable GR290 (Romano's star) in M33, and
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703048
Publikováno v:
Astron.Astrophys. 420 (2004) 527-532
We report on the June 2000 long (100 ks) BeppoSAX exposure that has unveiled above 10 keV a new very high energy component of the X-ray spectrum of Eta Car extending to at least 50 keV. We find that the 2-150 keV spectrum is best reproduced by a ther
Externí odkaz:
http://arxiv.org/abs/astro-ph/0402329
Autor:
Corcoran, M. F., Swank, J. H., Petre, R., Ishibashi, K., Davidson, K., Townsley, L., Smith, R., White, S., Viotti, R., Damineli, A.
Eta Car may be the most massive and luminous star in the Galaxy and is suspected to be a massive, colliding wind binary system. The CHANDRA X-ray observatory has obtained a calibrated, high-resolution X-ray spectrum of the star uncontaminated by the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0105335
Autor:
Greiner, J., Bickert, K., Luthardt, R., Viotti, R., Altamore, A., Gonzalez-Riestra, R., Stencel, R. E.
We present the results of an extensive campaign of coordinated X-ray (ROSAT) and UV (IUE) observations of the symbiotic star AG Dra during a long period of quiescence (1990-1993) followed by two optical outbursts in 1994 and 1995. The hot component (
Externí odkaz:
http://arxiv.org/abs/astro-ph/9612035