R L M Corradi

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Some classes of stars, including novae and supernovae, undergo explosive outbursts that eject stellar material into space. In 2002, the previously unknown variable star V838 Monocerotis brightened suddenly by a factor of approximately 10(4). Unlike a supernova or nova, it did not explosively eject its outer layers; rather, it simply expanded to become a(More)
  • U Munari, A Henden, S Kiyota, D Laney, F Marang, T Zwitter +6 others
  • 2002
V838 Mon is marking one of the most mysterious stellar outbursts on record. The spectral energy distribution of the progenitor resembles an under-luminous F main sequence star (at V =15.6 mag), that erupted into a cool supergiant following a complex and multi-maxima lightcurve (peaking at V =6.7 mag). The outburst spectrum show BaII, LiI and lines of(More)
We present spectroscopic and photometric observations of the recent peculiar outburst of V838 Mon, carried out at Rozhen and Toru´n observatories. Our data cover a period of three months beginning just before the second eruption. The evolution of the outburst is divided into four phases. The changes of particular spectral features for each of these phases(More)
Accretion disks and nuclear shell burning are present in some symbiotic stars (SS) and probably all supersoft X-ray binaries (SSXBs). Both the disk and burning shell may be involved in the production of dramatic outbursts and, in some cases, collimated jets. A strong magnetic field may also affect the accretion flow and activity in some systems.(More)
  • O Hernandez, K Fathi, C Carignan, J Beckman, J.-L Gach, P Balard +8 others
  • 2008
GHαFaS a new Fabry-Perot system, is now available at the William Herschel Telescope. It was mounted, for the first time, at the Nasmyth focus of the 4.2 meter WHT on La Palma in July 2007. Using modern technology, with a spectral resolution of the order R∼15000 , and with a seeing limited spatial resolution, GHαFaS will provide a new look at the Hα-emitting(More)
  • R Tylenda, N Siódmiak, S K Górny, R L M Corradi, H E Schwarz
  • 2003
We have measured angular dimensions of 312 planetary nebulae from their images obtained in Hα (or Hα + [NII]). We have applied three methods of measurements: direct measurements at the 10% level of the peak surface brightness , Gaussian deconvolution and second-moment deconvolution. The results from the three methods are compared and analysed. We propose a(More)
Barium stars and technetium-poor, extrinsic S stars are binary systems with a white dwarf companion, and with orbital elements similar to those of symbiotic systems. One may thus wonder whether these various families of binary systems involving red giant stars are somehow related. This question is actually twofold: (i) Do barium and binary S stars exhibit(More)
  • D R Gonçalves, R L M Corradi, E Villaver, A Mampaso, M Perinotto, Di Firenze +1 other
In this contribution we discuss new results of a program aimed at studying the physical properties, origin and evolution of " low-ionization, small-scale structures in PNe ". Within this project we classify and discuss the properties of a sample of more than 50 PNe, collected from the literature, in the light of their possible formation mechanisms. In(More)
  • M Santander-García, P Rodríguez-Gil, R L M Corradi, D Jones, B Miszalski, H M J Boffin +2 others
  • 2015
The planetary nebula stage is the ultimate fate of stars with masses one to eight times that of the Sun (M(⊙)). The origin of their complex morphologies is poorly understood, although several mechanisms involving binary interaction have been proposed. In close binary systems, the orbital separation is short enough for the primary star to overfill its Roche(More)
O and early B stars are at the apex of galactic ecology, but in the Milky Way, only a minority of them may yet have been identified. We present the results of a pilot study to select and parametrise OB star candidates in the Southern Galactic plane, down to a limiting magnitude of g = 20. A 2 square-degree field capturing the Carina Arm around the young(More)