On the ultra-compact nature of 4U1822-000

Details On the ultra-compact nature of 4U1822-000 On the ultra-compact nature of 4U1822-000

2007-01-31

arxiv.org/abs/astro-ph/0701915v1

Mon.Not.Roy.Astron.Soc.376:1886-1888,2007

Astronomy and Astrophysics

Astrophysics

3 pages, 1 figure, accepted by MNRAS

Scientific paper

10.1111/j.1365-2966.2007.11579.x

We report the discovery of a periodic modulation in the optical lightcurve of the candidate ultra-compact X-ray binary 4U1822-000. Using time-resolved optical photometry taken with the William Herschel Telescope we find evidence for a sinusoidal modulation with a semi-amplitude of 8 percent and a period of 191 min, which is most likely close to the true orbital period of the binary. Using the van Paradijs & McClintock relation for the absolute magnitude and the distance modulus allowing for interstellar reddening, we estimate the distance to 4U1822-000 to be 6.3 kpc. The long orbital period and casts severe doubts on the ultra-compact nature of 4U1822-000.

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