Other Names V691 CrA, X Sgr X-7, 2A 1822-371, 3A 1822-371, H 1822-371, 1H 1822-371, 1M 1822-371, 1RXS J182546.8-370620, 2S 1822-371, 2U 1822-37, 3U 1822-37, 4U 1822-37, XB 1822-371  
INTEGRAL source ID J182546.8-370619 
External database entries Simbad, ADS, ISDC
Discovery Giacconi et al. (1972)
Dominant Accretion Type LMXRB, accretion disk corona Hellier & Mason (1989)  
Position RA, DEC 18h 25m 46.8s 
-37d 06m 19s 
Bradt & McClintock (1983)  
Position l,b 356.85  -11.29     
Distance 2.0-3.0 kpc  Mason & Cordova (1982)  
Typical Flux 0.010-0.025 Crab Energy Range 2 - 10 keV

Neutron Star Mass >0.97 Msun  +0 -0 Jonker et al. (2003) 
Neutron Star Luminosity 4.4x1034 erg/s   Mason & Cordova (1982) 

X 1822-371 is an eclipsing and dipping low mass X-ray binary (LMXB) and is the prototypical Accretion Disc Corona (ADC) source. It is the brightest eclipsing LMXB currently known. Its X-ray light curve shows a 5.57 h modulation. X 1822-371 is seen almost edge-on with an inclination angle i of about 85 degrees as given by Hellier and Mason (1989) The discovery of 0.59 s X-ray pulsation in RXTE data has been reported by Jonker & van der Klis (2001) . As second value for the intrinsic luminosity of the neutron star of 1.E38 erg/s has been published by Jonker & van der Klis (2001) .

Last modification date: Fri Aug 3 01:06:13 2007