The 2001 Superoutburst of WZ Sagittae
نویسندگان
چکیده
منابع مشابه
Dramatic Spectral Evolution of WZ Sagittae during the 2001 Superoutburst
We carried out optical spectroscopic observations of the most enigmatic dwarf nova WZ Sge in 11 nights during the 2001 superoutburst. Our observations covered the period from the initial phase several hours before the maximum to the ninth maximum of the rebrightening phase. The first spectrum shows absorption lines of H i (except for Hα), He i, and Na i, as well as emission lines of Heii , C ii...
متن کاملThe 2001 Superoutburst of WZ Sagittae: A Clue to the Dynamics of Accretion Disks
We examine the light curve of the July-August 2001 superoutburst of WZ Sagittae. During the decline from maximum light the locally defined decay time increases from ∼ 4 d mag to ∼ 12 d mag over the first ∼ 15 d of the ∼ 25 d superoutburst, as the system faded from mV ≃ 8.5 to mV ≃ 10. The superoutburst is caused by the sudden accretion of ∼ 10 g of gas onto the white dwarf, and the deviation fr...
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We argue that quiescent WZ Sge is a rapidly spinning magnetic rotator in which most of the matter transfered from the secondary is ejected from the system. Assuming that the observed 27.87 s oscillation period is due to the spinning white dwarf we propose that the other observed principal period of 28.96 s is a beat due to reprocessing of the rotating white dwarf beam on plasma blobs in Kepleri...
متن کاملWZ Sagittae - an old dwarf nova
We model the evolution of the accretion disk of WZ Sagittae during the long quiescence. We find that the large amount of mass in the disk derived from the outburst luminosity is a severe constraint and demands values of αc ≈ 0.001 in contradiction to some recent suggestions. We include in our computations the formation of an inner disk hole and the growth of the disk due to redistribution of an...
متن کاملObservations of WZ Sge in Superoutburst
We present seven separate Chandra observations of the 2001 superoutburst of WZ Sge. The high-energy outburst was dominated by intense EUV emission lines, which we interpret as boundary layer emission scattered into our line of sight in an accretion disc wind. The direct boundary layer emission was hidden from view, presumably by the accretion disc. The optical outburst orbital hump was detected...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 2002
ISSN: 0004-6280,1538-3873
DOI: 10.1086/341696