2001A&A...372..138R


Query : 2001A&A...372..138R

2001A&A...372..138R - Astronomy and Astrophysics, volume 372, 138-144 (2001/6-2)

New class of low frequency QPOs: Signature of nuclear burning or accretion disk instabilities?

REVNIVTSEV M., CHURAZOV E., GILFANOV M. and SUNYAEV R.

Abstract (from CDS):

We report the discovery of a new class of low frequency quasi-periodic variations of the X-ray flux in the X-ray bursters 4U1608-52 and 4U1636-536. We also report an occasional detection of a similar QPO in Aql X-1. The QPOs, associated with flux variations at the level of percents, are observed at a frequency of 7-9x10–3 Hz. While usually the relative amplitude of flux variations increases with energy, the newly discovered QPOs are limited to the softest energies (1-5 keV). The observations of 4U1608-52 suggest that these QPOs are present only when the source X-ray luminosity is within a rather narrow range and they disappear after X-ray bursts. Approximately at the same level of the source luminosity, type I X-ray bursts cease to exist. Judging from this complex of properties, we speculate that a special mode of nuclear burning at the neutron star surface is responsible for the observed flux variations. Alternatively, some instabilities in the accretion disk may be responsible for these QPOs.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - instabilities - stars: binaries: general - stars: neutron X-rays: general - X-rays: stars

CDS comments: in ref list Bildsten 1993ApJ...418L..21B instead of 418.21

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 854 1
2 V* V801 Ara LXB 16 40 55.5979962948 -53 45 04.953475039 17.50 18.20 17.5   17.07 ~ 809 1
3 4U 1758-25 LXB 18 01 09.7308941918 -25 04 44.128444504     11.08     ~ 624 1
4 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1047 1
5 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2385 0

    Equat.    Gal    SGal    Ecl

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2021.07.25-18:03:26

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