2001A&A...370..479O


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.20CEST08:41:44

2001A&A...370..479O - Astronomy and Astrophysics, volume 370, 479-487 (2001/5-1)

On the X-ray fast-time variability of Sco X-2 (GX 349+2).

O'NEILL P.M., KUULKERS E., SOOD R.K. and DOTANI T.

Abstract (from CDS):

We have analysed archived Ginga data on the Z source Sco X-2 (GX 349+2). We present the first detailed investigation of its X-ray fast-time variability, as a function of position in the Z track. During the two-day observation over the period 5-7 March 1989, the source was in the so-called flaring branch, and the lower part of the so-called normal branch. We found broad peaked noise with a centroid frequency and width of ∼4-7Hz and ∼6-12Hz respectively. The peaked noise was strongest in the lower flaring branch, with a maximum fractional rms amplitude of ∼3%. We conclude that it is not a manifestation of atoll source high frequency noise, as had been suggested, and compare it with the power spectral features seen in other Z sources. We find that the peaked noise is markedly different to the quasi-periodic oscillations found in the normal and flaring branches of Sco X-1; however it bears some resemblance to that seen in the flaring branch of Cyg X-2 at low overall intensities.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: binaries: close - stars: individual: Sco X-2 - GX 349+2 - stars: neutron - X-rays: stars

Simbad objects: 6

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Number of rows : 6

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 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1530 0
2 4U 1642-45 LXB 16 45 47.7 -45 36 40           ~ 381 1
3 V* V1101 Sco LXB 17 05 44.4915929414 -36 25 23.049863107   20.10 18.6     ~ 407 0
4 4U 1758-25 LXB 18 01 09.7308941918 -25 04 44.128444504           ~ 616 1
5 V* NP Ser LXB 18 16 01.389 -14 02 10.62   18.8       K 599 2
6 V* V1341 Cyg LXB 21 44 41.1544523872 +38 19 17.065856122 15.00 15.13 14.68 15.00   A9III 1074 1

    Equat.    Gal    SGal    Ecl

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2020.10.20-08:41:44

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