2005A&A...436..999R


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.28CET07:03:29

2005A&A...436..999R - Astronomy and Astrophysics, volume 436, 999-1008 (2005/6-4)

Quasi-periodic oscillations: Resonant shear Alfven waves in neutron star magnetospheres.

REZANIA V. and SAMSON J.C.

Abstract (from CDS):

We propose a new model for quasi-periodic oscillations (QPOs) based on oscillating magnetohydrodynamic modes in neutron star magnetospheres. We argue that the interaction of the accretion disk with the magnetosphere can excite resonant shear Alfven waves in a region of enhanced density gradients, the region where accretion material flows along the magnetic field lines in the magnetosphere (see Fig. 1). We demonstrate that depending on the distance of this region from the star and the magnetic field strength, the frequency of the field line resonance can range from several Hz (a weaker field, farther from the star), to approximately kHz frequencies (a stronger field, ∼2-10 stellar radii from the star). We show that such oscillations are able to significantly modulate inflow of matter from the high density region toward the star's surface and possibly produce the observed X-ray spectrum. In addition, we show that the observed 2:3 frequency ratio of QPOs is a natural result of our model.

Abstract Copyright:

Journal keyword(s): stars: neutron - stars: magnetic fields - X-rays: binaries

Simbad objects: 20

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Number of rows : 20

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* V1055 Ori LXB 06 17 07.3 +09 08 13   18.80 18.5     ~ 511 1
2 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 837 1
3 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1531 0
4 V* V801 Ara LXB 16 40 55.5979962948 -53 45 04.953475039 17.50 18.20 17.5   17.07 ~ 789 1
5 4U 1642-45 LXB 16 45 47.7 -45 36 40           ~ 381 1
6 V* V1101 Sco LXB 17 05 44.4915929414 -36 25 23.049863107   20.10 18.6     ~ 407 0
7 X Ara X-1 LXB 17 06 15.314 -43 02 08.69           ~ 239 1
8 4U 1705-44 LXB 17 08 54.470 -44 06 07.35           ~ 357 0
9 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5           ~ 763 1
10 NAME Rapid Burster LXB 17 33 24.61 -33 23 19.8           ~ 381 2
11 KS 1731-260 LXB 17 34 13.46 -26 05 18.6       22.8 20.9 ~ 395 0
12 V* V926 Sco LXB 17 38 58.3 -44 27 00 16.90 17.70 17.5     ~ 427 0
13 3FHL J1746.2-2852 LXB 17 44 33.09 -28 44 27.0           ~ 491 0
14 4U 1758-25 LXB 18 01 09.7308941918 -25 04 44.128444504           ~ 616 1
15 V* NP Ser LXB 18 16 01.389 -14 02 10.62   18.8       K 599 2
16 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 906 1
17 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1018 1
18 V* V1405 Aql LXB 19 18 47.871 -05 14 17.09 20.90 21.40 21.0     ~ 442 0
19 V* LZ Aqr LXB 21 23 14.54 -05 47 52.9 15.90 16.78 16.8     ~ 143 0
20 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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2020.10.28-07:03:29

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