SIMBAD references

2005ApJ...626..396P - Astrophys. J., 626, 396-410 (2005/June-2)

X-ray observations of the boundary layer in dwarf novae at low accretion rates.

PANDEL D., CORDOVA F.A., MASON K.O. and PRIEDHORSKY W.C.

Abstract (from CDS):

We present a spectral analysis of XMM-Newton data of 10 dwarf novae, 9 of which were observed during a quiescent state. The X-ray spectra indicate the presence of a hot, optically thin plasma with a temperature distribution consistent with a simple, isobaric cooling flow. The likely origin of the X-ray emission is cooling plasma in the boundary layer settling onto the white dwarf. Using a cooling flow model, we derive the temperatures, accretion rates, rotational velocities, and elemental abundances of the X-ray-emitting gas. We discuss the implications of our findings for the structure of the boundary layer. A comparison of X-ray and ultraviolet luminosities finds no evidence of underluminous boundary layers in any of the quiescent dwarf novae. The X-ray spectrum of EI UMa differs significantly from those of the other objects, showing a strong fluorescent Fe Kα line and a strong O VII line triplet. Based on the observational evidence, we argue that EI UMa is most likely an intermediate polar and not, as previously thought, a dwarf nova.

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Journal keyword(s): Accretion, Accretion Disks - Stars: Binaries: Close - Stars: Novae, Cataclysmic Variables - Stars: Dwarf Novae - Stars: Individual: Constellation Name: OY Carinae - Stars: Individual: Constellation Name: WW Ceti - Stars: Individual: Constellation Name: AB Draconis - Stars: Individual: Constellation Name: U Geminorum - Stars: Individual: Constellation Name: VW Hydri - Stars: Individual: Constellation Name: WX Hydri - Stars: Individual: Constellation Name: T Leonis - Stars: Individual: Constellation Name: TY Piscis Austrini - Stars: Individual: Constellation Name: EI Ursae Majoris - Stars: Individual: Constellation Name: SU Ursae Majoris - X-Rays: Binaries

Simbad objects: 10

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