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J/A+A/458/21        INTEGRAL burst observations of 4U 1728-34  (Falanga+, 2006)

The X-ray spectrum of the bursting atoll source 4U 1728-34 observed with INTEGRAL. Falanga M., Goetz D., Goldoni P., Farinelli R., Goldwurm A., Mereghetti S., Bazzano A., Stella L. <Astron. Astrophys. 458, 21 (2006)> =2006A&A...458...21F
ADC_Keywords: X-ray sources ; Gamma rays Keywords: binaries: close - stars: pulsars: individual: 4U 1728-34 - stars: neutron - X-rays: bursts Abstract: We present for the first time a study of the 3-200keV broad band spectra of the bursting atoll source 4U 1728-34 (GX 354-0) along its hardness intensity diagram. The analysis was done using the INTEGRAL public and Galactic Center deep exposure data ranging from February 2003 to October 2004. Objects: ------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------ 17 31 57.4 -33 50 05 4U 1728-34 = GX 354-00 ------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 85 36 Log of INTEGRAL burst observations analyzed in this paper and spectral properties of the bursts
See also: J/A+A/411/L59 : INTEGRAL reference catalog (Ebisawa+, 2003) J/A+A/438/1175 : First INTEGRAL SPI-ACS Gamma-Ray Burst Catalogue (Rau+, 2005) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Burst Burst number 3 A1 --- n_Burst [+] +: bright type I X-ray bursts 6- 15 A10 "YYYY/MM/DD" Date IBIS/JEMX date 17- 24 A8 "h:m:s" Tstart IBIS/JEM-X starting time, in hh:mm:ss 26- 29 F4.1 s DTburst ?=- IBIS time interval of the burst (1) 31- 32 F2.1 s e_DTburst ? rms uncertainty on DTburst 34- 37 F4.2 s tauexp ?=- JEMX burst exponential decay time, in the 3-20keV energy band 39- 40 F2.1 s e_tauexp ? rms uncertainty on tauexp 42- 45 F4.1 kg/cm2/s dm/dt ?=- Mass accretion rate per unit area of the persistent emission before the bursts (2) 47- 48 F2.1 kg/cm2/s e_dm/dt ? rms uncertainty on dm/dt 50- 52 F3.1 10-10J/m2 Eb ?=- Net burst fluence, persistent emission subtracted (in 10-7erg/cm-2) 54- 55 F2.1 10-10J/m2 e_Eb ? rms uncertainty on Eb 57- 59 F3.1 10-11W/m2 Fpeak ?=- Net burst peak flux, persistent emission subtracted (in 10-8erg/cm2/s) 61- 62 F2.1 10-11W/m2 e_Fpeak ? rms uncertainty on Fpeak 64- 66 F3.1 s tau ?=- Burst parameter tau=Eb/Fpeak 68- 69 F2.1 s e_tau ? rms uncertainty on tau 71- 75 F5.3 --- gamma ?=- Burst parameter gamma=Fpers/Fpeak 77- 80 F4.3 --- e_gamma ? rms uncertainty on gamma 82 A1 --- l_alpha [~] Limit flag on alpha 83- 85 I3 --- alpha ?=- Burst parameter alpha (3)
Note (1): "---" means not a statistically significant detection in ISGRI. Note (2): Assuming a canonical neutron star radius of 10km. Note (3): The quantity alpha is defined as the ratio of the total energy emitted in the persistent flux to that emitted in bursts, alpha=Fpers*Δt/Eb, where Δt is the time interval from the beginning of one burst to the next. We report only the most confident alpha values, i.e. without data gap between two bursts.
Acknowledgements: Maurizio Falanga, mfalanga(at)
(End) Patricia Vannier [CDS] 09-Oct-2006
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