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

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

2005-02-26

arxiv.org/abs/astro-ph/0502558v2

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, 2 tables, accepted for publication in A&A. This version: a few typos corrected

Scientific paper

10.1051/0004-6361:20040405

We analyse ~ 360 ks of archival data from the Rossi X-Ray Timing Explorer (RXTE) of the 21 hr 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 (0.5-0.7 L_Edd) 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.

Affiliated with

Also associated with

No associations

Rating

RXTE observations of the dipping low-mass X-ray binary 4U 1624-49 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with RXTE observations of the dipping low-mass X-ray binary 4U 1624-49, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RXTE observations of the dipping low-mass X-ray binary 4U 1624-49 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-33104