2005A&A...435.1005L


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST08:16:46

2005A&A...435.1005L - Astronomy and Astrophysics, volume 435, 1005-1011 (2005/6-1)

RXTE observations of the dipping low-mass X-ray binary 4U 1624-49.

LOMMEN D., VAN STRAATEN S., VAN DER KLIS M. and ANTHONISSE B.

Abstract (from CDS):

We analyse ∼360ks of archival data from the Rossi X-Ray Timing Explorer (RXTE) of the 21h orbital period dipping low-mass X-ray binary 4U 1624-49. We find that outside the dips the tracks in the colour-colour and hardness-intensity diagrams (CDs and HIDs) are reminiscent of those of atoll sources in the middle and upper parts of the banana branch. The tracks show secular shifts up to ∼10%. We study the power spectrum of 4U 1624-49 as a function of the position in the CD. This is the first time power spectra of this source are presented. No quasi-periodic oscillations (QPOs) are found. The power spectra are dominated by very low frequency noise (VLFN), characteristic for atoll sources in the banana state, and band limited noise (BLN) which is not reliably detected but may, uncharacteristically, strengthen and increase in frequency with spectral hardness. The VLFN fits to a power law, which becomes steeper when the source moves to the harder part of the CD. We conclude that 4U 1624-49 is an atoll source which in our observations is in the upper banana branch. Combining this with the high (0.5-0.7LEdd) luminosity, the long-term flux stability of the source as seen with the RXTE All-Sky Monitor (ASM), and with the fact that it is an X-ray dip source, we conclude that 4U 1624-49 is most likely a GX atoll source such as GX 3+1 and GX 9+9, but seen edge on.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: individual: 4U 1624-49 - stars: neutron - X-rays: stars

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Big Dipper LXB 16 28 05.5318316228 -49 12 40.011030945           ~ 208 0
2 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 419 0
3 V* V801 Ara LXB 16 40 55.5979962948 -53 45 04.953475039 17.50 18.20 17.5   17.07 ~ 787 1
4 V* V2216 Oph LXB 17 31 44.17 -16 57 40.9 16.40 17.10 16.8     ~ 262 1
5 X Sgr X-1 LXB 17 47 56.0 -26 33 49           ~ 347 0
6 X Sgr X-3 LXB 18 01 32.3 -20 31 44           ~ 219 1
7 V* V5512 Sgr LXB 18 14 31.55 -17 09 26.7           K5III 352 0

    Equat.    Gal    SGal    Ecl

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2020.08.09-08:16:46

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