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Giovannelli, F.; Sabau-Graziati, L.

doi:10.1023/a:1011607814902

Cited by 25 publications

(43 citation statements)

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“…A similar doublepeaked normal outburst was already observed for A 0535+26 prior to the 1994 giant outburst [23]. The August 2009 outburst might be comparable to the 'noisy' or 'anomalous' outbursts discussed in [6], although the different sampling makes this difficult to assess.…”

Section: Pos(extremesky2009)063supporting

confidence: 63%

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New outburst of A0535+26 observed with INTEGRAL, RXTE and Suzaku

Caballero¹,

Pottschmidt²,

Barragán³

et al. 2010

Proceedings of the Extreme Sky: Sampling the Universe Above 10 keV — PoS(extremesky2009)

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A normal outburst of the Be/X-ray binary system A0535+26 has taken place in August 2009. It is the fourth in a series of normal outbursts that have occured around the periastron passage of the source, but is unusual by starting at an earlier orbital phase and by presenting a peculiar double-peaked light curve. A first "flare" (lasting about 9 days from MJD 55043 on) reached a flux of 440 mCrab. The flux then decreased to less than 220 mCrab, and increased again reaching 440 mCrab around the periastron at MJD 55057. Target of Opportunity observations have been performed with INTEGRAL, RXTE and Suzaku. First results of these observations are presented, with special emphasis on the cyclotron lines present in the X-ray spectrum of the source, as well as in the pulse period and energy dependent pulse profiles of the source.

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Section: Pos(extremesky2009)063supporting

confidence: 63%

“…[5]. An extensive review is given in [6]. Since its discovery, five 1 giant outbursts have been detected, in October 1980 [8], June 1983 [9], March/April 1989 [10], February 1994 [11] and May/June 2005 [12].…”

Section: Introductionmentioning

confidence: 99%

New outburst of A0535+26 observed with INTEGRAL, RXTE and Suzaku

Caballero¹,

Pottschmidt²,

Barragán³

et al. 2010

Proceedings of the Extreme Sky: Sampling the Universe Above 10 keV — PoS(extremesky2009)

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“…Reviews of SS Cygni discussing its multi-frequency behavior and models include those of Giovannelli & Martinez-Pais (1991), , and Giovannelli & Sabau-Graziati (1998). Among the spectroscopic studies of SS Cygni, we highlight the two studies of Martinez-Pais et al (1994) and MartinezPais et al (1996).…”

Section: Introductionmentioning

confidence: 93%

Structure of the pre-outburst accretion disk in SS Cygni

Kononov

Giovannelli

Bruni

et al. 2012

A&A

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We present results of spectroscopic observations of SS Cygni performed at the 1.5 m telescope of the Loiano Observatory in June 2009, three days before a long outburst. Using results of these observations, we computed Doppler tomograms in three Balmer lines H β , H γ , and H δ . Analyzing the tomograms, we identified gas dynamic features existing in the system. It is shown that in the preoutburst disk a number of shock waves exist. These waves are "hot line" a wave produced by the interaction between the circum-disk halo and the stream from the inner Lagrangian point L 1 , and two arms of the spiral tidal shock and bow shock caused by the motion of the accretor and disk in the gas of the circum-binary envelope. We also found that before the outburst the density and size of the disk increase.

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“…Accretion Processes in Astrophysics Franco Giovannelli In binary systems there are essentially two ways for accreting matter from one star to the other: via accretion disk or via stellar wind (Giovannelli & Sabau-Graziati, 2001, adapted from Blumenthal & Tucker, 1974) (left panel of Fig 19). But in some cases there is a third way which is a mixture between the two, as for instance in eccentric binary systems close to the periastron passage where a temporary accretion disk can be formed around the neutron star (e.g.…”

Section: Pos(apcs2016)001mentioning

confidence: 99%