Query : 2014A&A...561A.117E

2014A&A...561A.117E - Astronomy and Astrophysics, volume 561A, 117-117 (2014/1-1)

Swift X-ray and ultraviolet observations of the shortest orbital period double-degenerate system RX J0806.3+1527 (HM Cnc).


Abstract (from CDS):

The system RX J0806.3+1527 (HMCnc) is a pulsating X-ray source with 100 per cent modulation on a period of 321.5 s (5.4 min). This period reflects the orbital motion of a close binary consisting of two interacting white dwarfs. Here we present a series of simultaneous X-ray (0.2-10 keV) and near-ultraviolet (2600 Å and 1928 Å) observations that were carried out with the Swift satellite. In the near-ultraviolet, the counterpart of RX J0806.3+1527 was detected at flux densities consistent with a blackbody with a temperature of (27±8)x103 K. We found that the emission at 2600 Å is modulated at the 321.5-s period with the peak ahead of the X-ray one by 0.28±0.02 cycles and is coincident within ±0.05 cycles with the optical. This phase-shift measurement confirms that the X-ray hot spot (located on the primary white dwarf) is at about 80°-100° from the direction that connects the two white dwarfs. Albeit at lower significance, the 321.5-s signature is also present in the 1928-Å data; at this wavelength, however, the pulse peak is better aligned with that observed at X-rays. We use the constraints on the source luminosity and the geometry of the emitting regions to discuss the merits and limits of the main models for RX J0806.3+1527.

Abstract Copyright:

Journal keyword(s): stars: individual: RX J0806.3+1527 (HM Cnc) - X-rays: binaries - ultraviolet: stars - binaries: close - white dwarfs

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 RX J0806.3+1527 XB* 08 06 22.9520149296 +15 27 31.002199488   20.7 20   21.2 ~ 134 0
2 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2606 0
3 RX J1914.4+2456 XB* 19 14 26.09 +24 56 44.6           ~ 132 0

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