C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:55:28

2014A&A...566A.121N - Astronomy and Astrophysics, volume 566A, 121-121 (2014/6-1)

XMM-Newton and Swift observations of WZ Sagittae: spectral and timing analysis.


Abstract (from CDS):

WZ Sagittae is the prototype object of a subclass of dwarf novae with rare and long (super)outbursts, in which a white dwarf primary accretes matter from a low mass companion. High-energy observations offer the possibility of a better understanding of the disk-accretion mechanism in WZ Sge-like binaries. We used archival XMM-Newton and Swift data to characterize the X-ray spectral and temporal properties of WZ Sge in quiescence. We performed a detailed timing analysis of the simultaneous X-ray and UV light curves obtained with the EPIC and OM instruments on board XMM-Newton in 2003. We employed several techniques in this study, including a correlation study between the two curves. We also performed an X-ray spectral analysis using the EPIC data and Swift/XRT data obtained in 2011. We find that the X-ray intensity is clearly modulated at a period of ≃28.96s, confirming previously published preliminary results. We find that the X-ray spectral shape of WZ Sge remains practically unchanged between the XMM-Newton and Swift observations. However, after correcting for interstellar absorption, the intrinsic luminosity is estimated to be LUnaX=(2.65±0.06)x1030erg/s and LUnaX=(1.57±0.03)x1030erg/s in 2003 and 2011, respectively. During the Swift/XRT observation, the observed flux is a factor ≃2 lower than that observed by XMM-Newton but is similar to the quiescent levels that are observed various times before the 2001 outburst.

Abstract Copyright:

Journal keyword(s): binaries: general - white dwarfs - X-rays: binaries

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 V* EQ Lyn CV* 07 45 31.9386690165 +45 38 29.743181853           ~ 23 0
2 V* U Gem DN* 07 55 05.2323858391 +22 00 05.045435077   15.3 14.54     DA 1046 0
3 V* GW Lib DN* 15 19 55.3336459070 -25 00 24.613958659   9.0       ~ 181 0
4 V* WZ Sge DN* 20 07 36.5036203067 +17 42 14.733657651   15.30 15.20     DAepv 888 0
5 V* V455 And DN* 23 34 01.4485468687 +39 21 40.866526351   16.22 16.09 16.14   ~ 115 0

    Equat.    Gal    SGal    Ecl

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