Query : 2011A&A...529A.116T

2011A&A...529A.116T - Astronomy and Astrophysics, volume 529A, 116-116 (2011/5-1)

XMM-Newton observations of the X-ray soft polar QS Telescopii.


Abstract (from CDS):

On the basis of XMM-Newton observations, we investigate the energy balance of selected magnetic cataclysmic variables, which have shown an extreme soft-to-hard X-ray flux ratio in the ROSAT All-Sky Survey. We intend to establish the X-ray properties of the system components, their flux contributions, and the accretion geometry of the X-ray soft polar QS Tel. In the context of high-resolution X-ray analyses of magnetic cataclysmic variables, this study will contribute to better understanding the accretion processes on magnetic white dwarfs. During an intermediate high state of accretion of QS Tel, we have obtained 20ks of XMM-Newton data, corresponding to more than two orbital periods, accompanied by simultaneous optical photometry and phase-resolved spectroscopy. We analyze the multi-wavelength spectra and light curves and compare them to former high- and low-state observations. Soft emission at energies below 2keV dominates the X-ray light curves. The complex double-peaked maxima are disrupted by a sharp dip in the very soft energy range (0.1-0.5keV), where the count rate abruptly drops to zero. The EPIC spectra are described by a minimally absorbed black body at 20eV and two partially absorbed mekal plasma models with temperatures around 0.2 and 3keV. The black-body-like component arises from one mainly active, soft X-ray bright accretion region nearly facing the mass donor. Parts of the plasma emission might be attributed to the second, virtually inactive pole. High soft-to-hard X-ray flux ratios and hardness ratios demonstrate that the high-energy emission of QS Tel is substantially dominated by its X-ray soft component.

Abstract Copyright:

Journal keyword(s): novae, cataclysmic variables - stars: fundamental parameters - stars: individual: QS Telescopii - X-rays: binaries - accretion, accretion disks

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 V* AI Tri CV* 02 03 48.6151979976 +29 59 25.897508700           M2.5 45 1
2 V* EF Eri CV* 03 14 13.2526234800 -22 35 42.900077688   15.4 14.53 13.5   ~ 435 0
3 V* UZ For CV* 03 35 28.6518733656 -25 44 21.768755424           M4.5 267 0
4 V* V1309 Ori CV* 05 15 41.4123253872 +01 04 40.481073984           M0.5 109 0
5 V* BY Cam CV* 05 42 48.8013535344 +60 51 31.376128608   16.60       ~ 258 0
6 V* QS Tel CV* 19 38 35.8144163880 -46 12 57.106344420           ~ 115 0
7 V* QQ Vul CV* 20 05 41.9090048400 +22 39 58.839854760   14.688 14.656 14.584   M2 200 0

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