The discovery of 2.93 hour periodic intensity dips from X1323-619

Details The discovery of 2.93 hour periodic intensity dips from X1323-619 The discovery of 2.93 hour periodic intensity dips from X1323-619

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338.1024p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 1024-1032.

Other

24

Companion Stars, Gamma Ray Bursts, Light Curve, Stellar Mass, X Ray Binaries, Exosat Satellite, Heao 2, Stellar Spectra, X Ray Spectra

Scientific paper

A 30 hr duration Exosat observation of the low-mass X-ray binary X1323-619 is reported. The 1-8 keV light curve obtained with the medium-energy (ME) instrument shows irregular intensity dips that recur every 2.93 hr as well as type 1 X-ray bursts. The intensity declines to about 50 percent of its unaffected value during the 50-minute duration dips. The dip and burst-free ME spectrum is similar to that of other X-ray burst sources, being fitted by a power-law model with energy index 0.5. Considerable low-energy absorption is also required. Spectral changes observed during dipping intervals are consistent with absorption by material with a wide range of abundances. From an analysis of the burst properties, the distance of X1323-619 is constrained to be between 10 and 20 kpc.

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