Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Nesci, Roberto"'
We discuss the optical light curves of two Be X-ray Binaries, IGR J06074+2205 and SAX J2103.5+4545 recovered from the ATLAS, ZTF and ASAS-SN databases. Both sources show long term optical variability of 620 and 420 days respectively, with color redde
Externí odkaz:
http://arxiv.org/abs/2403.15746
Publikováno v:
Open European Journal on Variable Stars 2023-0236
The light curve of the cataclismic variable ASASSN-18aan is studied using recent observations of the MC589 Observatory, giving an orbital Period and Epoch fully consistent with the data obtained after the discovery flare in 2018. Archival data from A
Externí odkaz:
http://arxiv.org/abs/2304.09829
Publikováno v:
OEJV 2022, 230, 1
We analyzed the light curves of 165 AGB variables, mostly Miras, in the sky area centered between M16 and M17 (l=16, b=0), using the OGLE GVS database in the I_C band. Comparison with the published light curves, derived about 50 years earlier by P.~M
Externí odkaz:
http://arxiv.org/abs/2206.00905
Autor:
Nesci, Roberto, Rocchi, Gianni
We reobserved in the $R_C$ and $i'_{Sloan}$ bands, during the years 2020-2021, seven Mira variables in Cassiopeia, for which historical $i'_{Sloan}$ light curves were available from Asiago Observatory plates taken in the years 1967-84. The aim was to
Externí odkaz:
http://arxiv.org/abs/2105.09018
Autor:
Nesci, Roberto, Tuvikene, Taavi, Rossi, Corinne, Gaudenzi, Silvia, Galleti, Silvia, Ochner, Paolo, Enke, Harry
We report the spectroscopic and photometric monitoring of a sample of 530 candidate AGB stars in a 5 degrees field, selected from the IPHAS catalog: historic light curves were derived from Asiago IR plates taken in the years 1965 -1984. We found 10 M
Externí odkaz:
http://arxiv.org/abs/1805.09191
Autor:
Dutka, Michael S., Carpenter, Bryce D., Ojha, Roopesh, Finke, Justin D., D'Ammando, Filippo, Kadler, Matthias, Edwards, Philip G., Stevens, Jamie, Torresi, Eleonora, Grandi, Paola, Nesci, Roberto, Krauss, Felicia, Mueller, Cornelia, Wilms, Joern, Gehrels, Neil
Quasi-simultaneous observations of the Flat Spectrum Radio Quasar PKS 2326-502 were carried out in the gamma-ray, X-ray, UV, optical, near-infrared, and radio bands. Thanks to these observations we are able to characterize the spectral energy distrib
Externí odkaz:
http://arxiv.org/abs/1612.08061
Autor:
Krauß, Felicia, Wilms, Joern, Kadler, Matthias, Ojha, Roopesh, Schulz, Robert, Trüstedt, Jonas, Edwards, Philip G., Stevens, Jamie, Ros, Eduardo, Baumgartner, Wayne, Beuchert, Tobias, Blanchard, Jay, Buson, Sara, Carpenter, Bryce, Dauser, Thomas, Falkner, Sebastian, Gehrels, Neil, Gräfe, Christina, Gulyaev, Sergei, Hase, Hayo, Horiuchi, Shinji, Kreikenbohm, Annika, Kreykenbohm, Ingo, Langejahn, Marcus, Leiter, Katharina, Lovell, Jim E. J., Müller, Cornelia, Natusch, Tim, Nesci, Roberto, Pursimo, Tapio, Phillips, Chris, Plötz, Christian, Quick, Jonathan, Tzioumis, Anastasios K., Weston, Stuart
Publikováno v:
A&A 591, A130 (2016)
Simultaneous broadband spectral and temporal studies of blazars are an important tool for investigating active galactic nuclei (AGN) jet physics. We study the spectral evolution between quiescent and flaring periods of 22 radio-loud AGN through multi
Externí odkaz:
http://arxiv.org/abs/1605.00841
We have performed new medium resolution spectroscopy, optical and near infrared photometry to monitor the variability of the AGB carbon star V 381 Lac. Our observations revealed rapid and deep changes in the spectrum and extreme variability in the op
Externí odkaz:
http://arxiv.org/abs/1512.00146
We present moderate resolution CCD spectra and R photometry for seven KP2001 stars. We revised the spectral classification of the stars in the range 3900 - 8500 A. On the bases of light curves of the NSVS (Northern Sky Variability Survey) database we
Externí odkaz:
http://arxiv.org/abs/1509.01828
Publikováno v:
A&A 576, A124 (2015)
The scenario of galaxy formation is believed to follow a structure that builds up from the bottom, with large galaxies being formed by several merging episodes of smaller ones. In this scenario a number of galaxies can be expected to be seen in the m
Externí odkaz:
http://arxiv.org/abs/1503.04442