[vsnet-newvar 2579] SDSS J092638.71+362402.4

[Taichi Kato]

   The object has an orbital period of 28 min.  Quiescent magnitude
outside the eclipses is about 19.  If it undergoes an outburst,
it will be an extremely suitable target for high-speed photometry
(superhumps are naturally expected).

object name and position: SDSS J092638.71+362402.4

===

Title: SDSS J0926+3624, the first eclipsing AM CVn star, as seen by ULTRACAM
Authors: T. R. Marsh, V. S. Dhillon, S. Littlefair, P. Groot, P. Hakala, G.
  Nelemans, G. Ramsay, G. Roelofs, D. Steeghs
Comments: To appear in Proc 15th European White Dwarf Workshop, held in
  Leicester Aug 7-11th 2006, and to be published by ASP
\\
  We present light curves of SDSS J0926+3624, the first eclipsing AM CVn star,
observed with the high-speed CCD camera ULTRACAM on the WHT. We find unusually
that the accreting white dwarf is only partially eclipsed by its companion.
Apart from this, the system shows the classic eclipse morphology displayed by
eclipsing dwarf novae, namely the eclipse of a white dwarf and accretion disc
followed by that of the bright spot where the mass transfer stream hits the
disc. We are able to fit this well to find masses of the accretor and donor to
be M1 = 0.84 +/- 0.05 Msun and M2 = 0.029 +/- 0.02 Msun respectively. The mass
of the donor is significantly above its zero temperature value and it must
possess significant thermal content.
\\ ( http://arXiv.org/abs/astro-ph/0610414 ,  218kb)