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Title: Photometry of V407 Vul and RXJ0806.3+1527: Twin systems ?
Author(s): Barros, S.C.C.; Marsh, T.R.; Dhillon, V.S.; Groot, P.J. ; Littlefair, S.; Nelemans, G.A. ; Roelofs, G.H.A. ; Steeghs, D.; Wheatley, P.J.
Publication year: 2007
In: American Institute of Physics Conference Series, pp. 873-876
Publisher: Melville, N.Y. : American Institute of Physics
ISBN: 0735404348
Related links: http://ukads.nottingham.ac.uk/abs/2007AIPC..924..873B
Publication type: Article in monograph or in proceedings

Please use this identifier to cite or link to this item : http://hdl.handle.net/2066/36319   http://hdl.handle.net/2066/36319

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Subject: Astronomy
Organization: Astrophysics
Book title: American Institute of Physics Conference Series
Page start: p. 873
Page end: p. 876
Abstract:
We present new photometry of V407 Vul and RXJ0806.3+1527. These stars are thought to be ultra-compact pairs of white dwarfs and the shortest period binaries known. They have periods of 569 and 321 sec respectively. We found that the X-ray and optical light curves of RXJ0806.3+1527 are not anti-phased as was previously thought. Instead, the X-ray lags the optical by 0.2 of cycle, indistinguishable from the phase offset seen in V407 Vul. Although very similar to RXJ0806.3+1527, V407 Vul surprisingly is observed to have the spectrum of a G star. We test whether this could be a line-of-sight coincidence by searching for variations in the V407 Vul's position on the sky on the 569 second period. We find that the G star is separated from the variable by 0.03 arcsec, and has no direct connection with the 569 second source. This supports a common nature for V407 Vul and RXJ0806.3+1527.

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