2003A&A...406..221S


Query : 2003A&A...406..221S

2003A&A...406..221S - Astronomy and Astrophysics, volume 406, 221-232 (2003/7-4)

Peculiar spectral and power spectral behaviour of the LMXB GX 13+1.

SCHNERR R.S., REERINK T., VAN DER KLIS M., HOMAN J., MENDEZ M., FENDER R.P. and KUULKERS E.

Abstract (from CDS):

We present results of an analysis of all 480 ks of Rossi X-ray Timing Explorer Proportional Counter Array data obtained from 17 May 1998 to 11 October 1998 on the luminous low mass X-ray binary GX 13+1. We analysed the spectral properties in colour-colour diagrams (CDs) and hardness-intensity diagrams (HIDs) and fitted the power spectra with a multi-Lorentzian model. GX 13+1 traces out a curved track in the CDs on a time scale of hours, which is very reminiscent of a standard atoll track containing an island, and lower and upper banana branch. However, both count rate and power spectral properties vary along this track in a very unusual way, not seen in any other atoll or Z source. The count rate, which varied by a factor of ∼1.6, along a given track first decreases and then increases, causing the motion through the HIDs to be in the opposite sense to that in the CD, contrary to all other Z and atoll sources. Along a CD track, the very low frequency noise uniquely decreases in amplitude from ∼5 to ∼2% (rms). The high frequency noise amplitude decreases from ∼4% to less than 1% and its characteristic frequency decreases from ∼10 to ∼5Hz. The 57-69Hz quasi-periodic oscillation (QPO) found earlier is also detected, and no kHz QPOs are found. In addition the entire track shows secular motion on a time scale of about a week. The average count rate as well as the amplitude of the very low frequency noise correlate with this secular motion. We discuss a possible explanation for the peculiar properties of GX 13+1 in terms of an unusual orientation or strength of a relativistic jet.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: individual: GX 13+1 - stars: neutron - binaries: close - X-rays: binaries

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1593 0
2 V* V801 Ara LXB 16 40 55.5976953528 -53 45 04.948107156 17.50 18.20 17.5   17.07 ~ 843 1
3 V* V1101 Sco LXB 17 05 44.4916006152 -36 25 23.049324480   20.10 18.6     ~ 425 0
4 X Sgr X-1 LXB 17 47 56.0 -26 33 49           ~ 366 0
5 V* V5512 Sgr LXB 18 14 31.55 -17 09 26.7     12.73     K5III 376 0
6 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 965 1
7 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4188 0
8 V* V1341 Cyg LXB 21 44 41.1544345272 +38 19 17.066570988 15.00 15.13 14.68 15.00   A9III 1116 1

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2023.01.27-13:14:14

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