Magnetically moderated outbursts of WZ Sagittae
نویسندگان
چکیده
منابع مشابه
WZ Sagittae as a DQ Herculis star
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 کاملDramatic 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 کاملKeck Infrared Spectroscopy of Wz Sagittae: Detection of Molecular Emission from the Accretion Disk
Time-resolved IR spectroscopy of WZ Sge was obtained using NIRSPEC on Keck II. We detect CO and H2 emission from the accretion disk, placing WZ Sge in a rarefied class of astronomical objects including young stellar objects and high-luminosity early-type stars. During the eclipse phase, the molecular emission greatly weakens, but no firm evidence for the secondary star is seen, allowing new lim...
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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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2007
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2006.11252.x