Abstract
view Abstract Citations (35) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Discovery of 2.93 Hour Periodic Intensity Dips from X1323-619 Parmar, A. N. ; Gottwald, M. ; van der Klis, M. ; van Paradijs, J. Abstract 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. Publication: The Astrophysical Journal Pub Date: March 1989 DOI: 10.1086/167255 Bibcode: 1989ApJ...338.1024P Keywords: Companion Stars; Gamma Ray Bursts; Light Curve; Stellar Mass; X Ray Binaries; Exosat Satellite; Heao 2; Stellar Spectra; X Ray Spectra; Astronomy; STARS: INDIVIDUAL ALPHANUMERIC: X1323-619; X-RAYS: BINARIES full text sources ADS | data products SIMBAD (13)
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