On the ultra-compact nature of 4U1822-000
| dc.creator | Shahbaz, T. | |
| dc.creator | Watson, C. A. | |
| dc.creator | Hernandez-Peralta, H. | |
| dc.date | 2007-01-31 | |
| dc.date.accessioned | 2026-07-07T10:21:40Z | |
| dc.date.available | 2026-07-07T10:21:40Z | |
| dc.description | 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. | |
| dc.description | 3 pages, 1 figure, accepted by MNRAS | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0701915 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0701915 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc.376:1886-1888,2007 | |
| dc.identifier | doi:10.1111/j.1365-2966.2007.11579.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/175253 | |
| dc.subject | Astrophysics | |
| dc.title | On the ultra-compact nature of 4U1822-000 | |
| dc.type | text |